JPH073865A - How to protect inspection pipelines when detecting leaks in vacuum pipelines - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the excavation work for repairing the leak point P by specifying the leak point P of the vacuum pipeline 1 is facilitated, the inspection pipeline 6 is connected by the wire 11 connected to the plug 9. The inner surface of the branch portion of the vacuum pipeline 1 and the inner surface of the inspection pipeline 6 are prevented from being rubbed, and the branch portion and the inspection pipeline 6 are prevented from being damaged. [Structure] A flexible protective tube 13 is inserted from the inspection pipeline 6 to a branch portion of the inspection pipeline 6 and the vacuum pipeline 1, and an inner surface of the branch portion of the inspection pipeline 6 and the vacuum pipeline 1 and an inner surface of the inspection pipeline 6. And the wire 11 with the flexible protection tube 13 interposed therebetween, the winch 10 applies tension to the wire 11 to insert the plug 9 into the vacuum pipeline 1 from the inspection pipeline 6 or inside the vacuum pipeline 1. When the wire 11 is pulled out by pulling the wire 11 after intermittently advancing / stopping, or after identifying the leakage point P of the vacuum conduit 1,
1 prevents the inner surface of the branch portion and the inner surface of the inspection conduit 6 from being rubbed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of protecting an inspection pipeline when a leak location of a vacuum pipeline buried in the ground such as a vacuum sewer pipe is detected.

[0002]

2. Description of the Related Art In a vacuum pipeline 1 such as an underground buried type vacuum sewer pipe shown in FIG. 8, for example, a plurality of section valves V1, V2, V3, V are provided at appropriate intervals from the downstream side of the vacuum pipeline 1.
4, V5 are interposed, and the section valve V is connected from the section valve V5 on the upstream side to the section valve V1 on the downstream side in the operating state of the vacuum pump 2.
Leakage point detection, which is performed by confirming that there is a leak point at a position upstream of the closed section valve by measuring a decrease in the degree of vacuum in the vacuum pipeline 1 while sequentially closing 4, V3 and V2. The method is known. According to this type of conventional leak point detection method, if there is a leak point P between the section valves V2 and V3, V5, V4, V
When the section valve is closed in the order of 3, V2, the section valve V5,
Even if V4 and V3 are closed, the degree of vacuum continues to drop, and the section valve V2
The vacuum level stops decreasing by closing the
The vacuum line 1 on the downstream side of 2 can be maintained at a predetermined vacuum degree. Therefore, it can be confirmed that the leakage point P exists in the vacuum pipeline 1 between the section valves V2 and V3. However, the leakage point P cannot be specified between the section valves V2 and V3. Therefore, there is a drawback that the excavation work for repairing the leakage point P is difficult.

Therefore, as shown in FIG. 2, a plurality of section valves V1, V2, V are provided at appropriate intervals from the downstream side of the vacuum pipeline 1.
3, V4, V5 are provided, and each section valve V1, V2, V3
Each of the section valves V1, V2, V is formed by branching a pressure extraction line 4 provided with a shutoff valve 3 near the upstream side of each of V4 and V5.
An inspection pipeline 6 that is normally closed by a closing member 5 is branched near the downstream side of each of V3, V4, and V5, and air is supplied by a manual pump 8 through a pressurizing hose 7 as shown in FIG. When expanded, it expands to an outer diameter that is in close contact with the inner surface of the vacuum pipeline 1, and when air is removed, it is elastically contracted to an outer diameter that allows it to move back and forth within the vacuum pipeline 1, as shown in FIG. A plug 9 having a diameter is provided, and the tip of a wire 11 that is fed or wound from a winch 10 is connected to the plug 9.

In such a structure, the section valve V
If there is a leakage point P between 2 and V3, V
When closing the interval valve in the order of 5, V4, V3, V2,
Even if the section valves V5, V4, and V3 are closed, the degree of vacuum continues to decrease, and by closing the section valve V2, the degree of vacuum is stopped, and the vacuum pipe line 1 downstream of the section valve V2 can be maintained at a predetermined degree of vacuum. . Therefore, the leakage point P is the section valve V2.
It can be confirmed that it exists in the vacuum line 1 between V3 and V3.

If it is confirmed that the leakage point P exists in the vacuum line 1 between the section valves V2 and V3, the section valve V2 upstream as shown in FIG. 5 with the section valves V2 and V3 closed. To the pressure extraction line 4 near the side of the vacuum pump 12A, the intake pipe 12B, the vacuum valve 12CT joint 12D and the vacuum gauge 12E.
A vacuum system 12 including the above is connected, the vacuum pump 12A is operated, and the inspection pipeline 6 near the downstream side of the section valve V3 is opened. That is, the closing member 5 is removed. And FIG.
As shown in (1), the wire 11 is drawn out by the winch 10 while applying tension, and the elastically reduced diameter plug 9 is inserted into the vacuum conduit 1 from the inspection conduit 6.

The elastically reduced diameter plug 9 inserted in the vacuum conduit 1 is connected to the upstream side in the vacuum conduit 1 which is generated by the operation of the vacuum pump 12A while continuing the feeding of the wire 11 while applying tension. It advances toward the downstream side due to the pressure difference on the downstream side. When the plug 9 has advanced to an appropriate position, the feeding of the wire 11 by the winch 10 is stopped, and the air is supplied to the plug 9 through the pressurizing hose 7 by the manual operation of the manual pump 8. As a result, as shown in FIG. 3, the plug 9 expands and comes into close contact with the inner surface of the vacuum line 1. Then, the operation of the vacuum pump 12A is stopped. If there is a leaking point at point P in the vacuum line 1 between the plug 9 and the section valve V2 shown in FIG. 7, the degree of vacuum decreases with time, and this is read by the scale of the vacuum gauge 12E. be able to.

When such a phenomenon occurs, the leakage point P is located closer to the section valve V2 than the close contact position of the plug 9. Therefore, a valve (not shown) provided on the connection side of the manual pump 8 in the pressurizing hose 7 is omitted.
Open, the plug 9 is once elastically reduced in diameter as shown in FIG. 3, and the operation of the vacuum pump 12A is restarted. At the same time, the winch 10 pulls out the wire 11 while tensioning the wire 11 to bring the plug 9 into an appropriate state. Forward to the position,
Here, after the plug 9 is expanded and brought into close contact with the inner surface of the vacuum line 1, the above-described work of stopping the operation of the vacuum pump 12A is repeated to move the plug 9 to the virtual line a position in FIG. It intermittently advances to the position b, the virtual line c position, and the virtual line d position and stops. As a result, plug 9
Even when the operation of the vacuum pump 12A is stopped after the vacuum pump 12A is brought into close contact with the inner surface of the vacuum conduit 1 by expanding at the position of the virtual line d passing through the leakage point P, the degree of vacuum does not decrease with time. That is, it can be specified that the leakage point P in the vacuum conduit 1 between the section valves V2 and V3 exists between the virtual line c position and the virtual line d position. Therefore, excavation work for repairing the leakage point P becomes easy.

However, the vacuum pipeline 1 used for underground sewage vacuum sewer piping or the like is generally made of a synthetic resin pipe, and the synthetic resin vacuum pipeline 1 to the synthetic resin inspection pipeline 6 are provided. It has a branched connection structure. Therefore, when the leakage point P is specified, as shown in FIG. 6, the wire 9 is drawn out while tensioning the wire 11 by the winch 10, and the elastically reduced diameter of the plug 9 is checked.
In the case where the plug 9 is inserted into the vacuum conduit 1 from the above, as shown in FIG. 7, when the plug 9 is intermittently advanced to the virtual line a position, the virtual line b position, the virtual line c position, and the virtual line d position and stopped, Alternatively, after the leakage point P is specified, the plug 9 is elastically reduced in diameter by the same operation as described above, and the wire 11 is wound by the winch 10 to remove the plug 9 from the vacuum pipeline 1 and the inspection pipeline 6. In the above, as shown by A and B in FIG.
The inner surface of the branch portion of the vacuum pipeline 1 and the inner surface of the inspection pipeline 6 are strongly rubbed, which may damage the branch portion and the inspection pipeline 6.

[0009]

The problem to be solved is to identify a leak point and facilitate an excavation work for repairing the leak point, and a wire connected to a plug leads to an inspection pipeline. This is a point where the inner surface of the branch portion of the vacuum pipeline and the inner surface of the inspection pipeline are strongly rubbed, and the branch portion and the inspection pipeline are damaged.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a plurality of section valves are provided in a vacuum line at appropriate intervals, and a pressure extraction line is provided with a stop valve near the upstream side of each section valve. However, an inspection pipeline that is normally closed by a closing member is branched near the downstream side of each section valve, and a pair of section valves adjacent to each other at the upstream position and the downstream position are closed. A plug that opens an inspection pipe line in the vicinity and expands from here to an outer diameter that is in close contact with the inner surface of the vacuum pipe when fluid is supplied, and that elastically contracts to an outer diameter that allows forward and backward movement in the vacuum pipe when fluid is not supplied Is supplied to the vacuum pipe line in a fluid non-supply state, and a vacuum system is connected to the pressure take-out pipe line in the vicinity of the downstream side section valve upstream side of the pair of section valves to start the fluid supply operation to the plug. Fluid non-supply by repeating fluid non-supply operation During operation, the plug is moved forward intermittently, and while gradually approaching the plug stop position during fluid supply operation to the downstream section valve, the degree of vacuum between the plug stop position and the downstream section valve is measured and the distance between the pair of section valves is increased. At the time of detecting the leak location of the vacuum pipeline for specifying the leak location of the vacuum pipeline, after inserting the flexible protective tube from the inspection pipeline to at least the branch portion between the inspection pipeline and the vacuum pipeline, A plug elastically reduced in diameter while applying tension to the wire inserted in the protection tube is intermittently advanced toward the downstream side section valve due to the pressure difference in the vacuum pipeline, and the wire is pulled after the leakage point is identified. The feature is that the plug is pulled out from the vacuum pipeline and the inspection pipeline, and even if the excavation work to identify the leak location and repair the leak location is facilitated, the wire connected to the plug Such inner surface and an inner surface of the inspection line of the bifurcation of the inspection line and vacuum line are avoided from being rubbed I achieved a purpose of reliably preventing damage to the bifurcation and inspection line.

[0011]

According to the present invention, since the flexible protective tube is interposed between the inner surface of the branch portion of the inspection pipeline and the vacuum pipeline and the inner surface of the inspection pipeline and the wire, the wire is fed while tension is applied. , When inserting an elastically contracted plug into the vacuum line from the inspection line, when intermittently advancing the plug in the vacuum line to stop it, or after identifying the leak location, make the plug elastic. When the wire is contracted and pulled out from the vacuum pipeline and the inspection pipeline by pulling the wire, the inner surface of the branch portion of the inspection pipeline and the vacuum pipeline and the inner surface of the inspection pipeline are not rubbed by the wire.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view showing an embodiment of the present invention, in which the same or corresponding parts as those in FIGS. In FIG. 1, after inserting the flexible protective pipe 13 from the inspection pipe 6 to the branch portion of the inspection pipe 6 and the vacuum pipe 1, a winch is applied to the wire 11 inserted in the flexible protection pipe 13. While applying tension by 10, the plug 9 that has been elastically reduced in diameter in the same manner as described above is intermittently advanced toward the downstream section valve V2 due to the pressure difference in the vacuum pipeline 1,
After identifying the leakage point P, the wire 1
1 is pulled to remove the plug from the vacuum line 1 and the inspection line 6.

That is, since the flexible protective tube 13 is interposed between the inner surface of the branch portion of the inspection pipeline 6 and the vacuum pipeline 1 and the inner surface of the inspection pipeline 6 and the wire 11, the winch 10 is attached to the wire 11. When the plug 9 which is drawn out while applying tension and elastically reduced in diameter is inserted into the vacuum pipeline 1 from the inspection pipeline 6, when the plug 9 is intermittently advanced in the vacuum pipeline 1 and stopped, or when leakage occurs. After the location P is specified, the plug 9 is elastically contracted, and the wire 11 is pulled by the winch 10 to pull it out from the vacuum pipeline 1 and the inspection pipeline 6. The inner surface of the branch portion and the inner surface of the inspection pipe line 6 (portions corresponding to A and B in FIG. 6) are not rubbed. Therefore, even if the leak location P of the vacuum pipeline 1 is specified and the excavation work for repairing the leak location P is facilitated, the inspection pipeline 6 and the vacuum pipeline 1 are connected by the wire 11 connected to the plug 9. It is possible to prevent the inner surface of the branch portion and the inner surface of the inspection pipeline 6 from being rubbed, and reliably prevent damage to the branch portion and the inspection pipeline 6.

[0014]

As described above, according to the present invention, when a leak occurs in the vacuum pipeline, even if the excavation work for identifying the leak location and repairing the leak location is facilitated, And the inner surface of the branch portion of the vacuum pipeline and the inner surface of the inspection pipeline,
Since the flexible protection tube is interposed between the wire and the wire connected to the plug, the inner surface of the branch portion of the inspection pipeline and the vacuum pipeline and the inner surface of the inspection pipeline are prevented from being rubbed, It is possible to reliably prevent damage to the branch portion and the inspection pipeline.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is a piping system diagram to which the present invention is applied.

FIG. 3 is an enlarged cross-sectional view showing a state where the plug expands and comes into close contact with the inner surface of the vacuum line.

FIG. 4 is an enlarged cross-sectional view of a plug elastically reduced in diameter so that it can be moved back and forth in a vacuum conduit.

FIG. 5 is an enlarged cross-sectional view showing a connected state of a vacuum system.

FIG. 6 is an enlarged cross-sectional view showing a state in which the plug is inserted into the vacuum pipeline from the inspection pipeline.

FIG. 7 is an operation explanatory diagram when a leaked portion is specified.

FIG. 8 is a piping system diagram of a conventional example.

[Explanation of symbols]

 1 Vacuum Pipeline 3 Closing Valve 4 Pressure Extraction Pipeline 5 Closing Member 6 Inspection Pipeline 9 Plug 12 Vacuum System 13 Flexible Protective Pipe P Leakage Point V1-V5 Section Valve

Claims (1)

[Claims] 1. A pressure extraction pipeline having a plurality of section valves interposed at appropriate intervals in a vacuum pipeline, and a stop valve provided near the upstream side of each section valve, and branched piping, and downstream of each section valve. The inspection pipeline that is normally closed by the closing member is branched near the side, and the inspection pipeline near the upstream side section valve downstream side is opened with a pair of section valves adjacent at the upstream position and the downstream position closed, From here, the plug that expands to an outer diameter that closely adheres to the inner surface of the vacuum pipeline when supplying fluid and elastically contracts to an outer diameter that allows forward and backward movement in the vacuum pipeline when not supplying the fluid is used in the vacuum tube in the non-fluid state A vacuum system is connected to the pressure extraction pipe line near the upstream side of the downstream side section valve in the pair of section valves and is activated by repeating the fluid supply operation and the fluid non-supply operation to the plug. Intermittently advance plug during non-supply operation While gradually advancing the plug stop position during fluid supply operation toward the downstream section valve, measure the degree of vacuum between the plug stop position and the downstream section valve to identify the leak point in the vacuum line between the pair of section valves. At the time of detecting a leak location of the specified vacuum pipeline, after inserting the flexible protective tube from the inspection pipeline to at least the branch portion between the inspection pipeline and the vacuum pipeline, the flexible protective tube is inserted. The plug, which is elastically reduced while applying tension to the wire, is intermittently advanced toward the downstream side section valve due to the pressure difference in the vacuum pipeline, and after the leakage point is identified, the wire is pulled to draw the vacuum pipeline and the inspection pipeline. A method for protecting the inspection pipeline when detecting a leak location in the vacuum pipeline, which is characterized in that the plug is pulled out from the