JP2022049807A - Leakage detection method and leakage detecting device - Google Patents

Abstract

To provide a leakage detection method capable of detecting a position of a moving body in a pipeline in which liquid having pressure is circulated and a leakage position correlated with the position, and to provide a leakage detecting device for executing the method.SOLUTION: A detection starting point B1 and a detection ending point B2 are set to the pipeline that allows liquid having pressure to be circulated, has a bent part and a flow change part, and should detect leakage of liquid, and a moving body 10 that is configured so as to travel along with liquid, and record a change in a traveling state at each time, and is configured so as to collect and record a transmission sound at each time is inserted from the detection starting point. A change in the traveling state of the moving body corresponding to time from the detection starting point is recorded and a transmission sound is collected and recorded. After the moving body is collected at the detection ending point, a leakage position in the pipeline is detected by means of traveling change data of the traveling state recorded in a process in which the moving body corresponding to time travels, sound data for collecting the transmission sound, and a laying chart of the pipeline.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method and an apparatus for detecting the presence or absence of leakage and the position of leakage in a pipeline buried in the ground where a liquid having pressure flows.

In the ground, pipelines through which liquids with various pressures, including water supply, industrial water, and agricultural water, flow are laid. In such a pipeline, standard-sized pipes are arranged, and the pipes are connected to each other while ensuring liquidtightness via a joint having a structure corresponding to the flowing liquid. For example, in the case of pipelines for industrial water and agricultural water, watertightness is ensured by connecting the ends of Hume pipes via packing. Further, in the case of a water supply pipeline, watertightness is ensured by bolting the ends of cast iron pipes to each other via packing.

The above-mentioned pipelines are not laid in a straight line in the ground, but are generally curved according to the surrounding topography and environment. In addition, some pipelines are provided with a valve plug portion for releasing the air that has entered the inside and a portion where the cross-sectional area is reduced or increased. The laying route of such a pipeline is recorded as a laying diagram.

On the other hand, the pipeline laid in the ground intersects with the force due to the vibration of the vehicle traveling on the road surface, the force due to the land subsidence, the laying direction of the pipeline or the laying direction of the pipeline at the time of an earthquake. Forces such as directional forces are always acting. Then, these forces acting on the pipeline may cause the seams of the pipes to be separated to form gaps, or may be deteriorated by long-term use to cause cracks in the pipe wall.

If gaps in the seams or cracks in the pipe wall occur in the pipeline through which the liquid with pressure flows, the liquid in circulation leaks into the ground, causing problems corresponding to the properties of the liquid in circulation. For example, in the case of industrial water, agricultural water, or clean water, these waters are treated according to their respective purposes, and water leakage causes waste of treatment costs. In addition, water leakage from the pipeline may soften the ground around the pipeline or change the soil. In particular, if the liquid contains an oil component, it may cause environmental pollution.

In order to detect the presence or absence and position of leakage in such a pipeline, the applicant has developed the "leakage detection device and leakage detection method" described in Patent Document 1, and has already obtained a patent right. There is. This technology is a moving body equipped with a sound collecting member, a recording member that records the sound collected by the sound collecting member, a transmitting member that transmits sound waves in a pulse shape, and a clock, and a clock of the transmitting member mounted on the moving body. It has a receiving member that receives the sound transmitted from the transmitting member in synchronization with.

When detecting the leak position, the moving body collects and records the sound generated when the liquid flows through the pipeline, and the liquid flows while transmitting a pulsed sound wave from the transmitting member. Move in the pipeline. Then, the sound transmitted from the moving body is received by the receiving member, and depending on the number of sound waves received, the difference between the time transmitted by the transmitting member and the time received by the receiving member, or the time difference of the received pulse interval. Detects the position of the moving object corresponding to the time axis. Further, the leakage position is detected by superimposing the sound data recorded when the liquid recorded corresponding to the time axis flows through the pipeline and the position of the moving body on the same time axis.

Japanese Patent No. 5583994

In the invention described in Patent Document 1, pulsed sound waves transmitted from an oscillating member arranged on a moving body are received and recorded in correspondence with a time axis defined by a clock. In this way, the moving position of the moving body can be detected.

However, it is unclear that the pulsed sound wave transmitted from the moving body collides with the tube wall in the process of traveling in the conduit and repeatedly reflects, and is a pulse as the distance to the moving body increases. become. Therefore, there is a possibility that the pulse reception accuracy will decrease as the moving distance of the moving body increases.

As the pulse reception accuracy decreases, the position accuracy of the moving object corresponding to the time axis also decreases, and the position where the sound generated when the liquid recorded corresponding to the same time axis flows through the pipeline is determined. There is a risk that the position accuracy at the time of detection will decrease.

An object of the present invention is a leak detection method capable of detecting the position of a moving body in a pipeline through which a liquid having pressure flows, and a leak position corresponding to this position, and a leak that implements this method. The purpose is to provide a detection device.

In order to solve the above problems, in a typical leak detection method according to the present invention, a liquid having pressure is circulated while being buried in the ground, and a two-dimensional or three-dimensional curved portion or a cross-sectional area changes. A detection start point and a detection end point are set for a pipeline that has a flow change part such as a cross-sectional area change part or a valve part that changes the flow velocity and flow direction of the liquid, or the flow direction, and the leakage of the liquid should be detected. The sound transmitted through the liquid flowing at each hour, while being configured to be set and travel with the liquid with pressure, to be able to record the movement speed and direction, or change in the direction of movement at each time. A moving body configured to collect and record sound is inserted from the detection starting point of the pipeline, and the moving speed and moving direction of the moving body in the pipeline corresponding to the time from the detection starting point. Alternatively, the change in the moving direction is recorded, and the sound transmitted via the liquid is collected and recorded, and after the moving body is collected at the detection end point of the pipeline, the moving body moves according to the time. The movement speed and direction of the moving body recorded in the process, the movement change data when the movement direction changes, the sound data collected from the sound transmitted through the flowing liquid, and the laying diagram of the pipeline. It is characterized by detecting the leakage position in the pipeline.

Further, in a typical leak detection device according to the present invention, a liquid having pressure is circulated while being buried in the ground, and a two-dimensional or three-dimensional curved portion or a cross-sectional area change portion whose cross-sectional area changes. Alternatively, it is a leak detection device for detecting a leak in a pipeline having a flow change portion where the flow velocity and flow direction of a liquid such as a valve portion or the flow direction changes, and the outer diameter of the pipe should detect the leak. It has a moving body that is smaller than the inner diameter of the path and moves with the liquid inside the pipeline, and is transmitted to the inside of the moving body via the liquid when the liquid flows through the conduit. A sound collecting member that collects the sound collected, a recording member that records the sound collected by the sound collecting member, and an accelerometer that senses and records a change in the moving speed and moving direction or the moving direction of the moving body. And the clock, are arranged.

The leak detection method according to the present invention is a method for detecting a leak in a pipeline (hereinafter, simply referred to as “pipeline”) through which a liquid having pressure (hereinafter, simply referred to as “liquid”) flows. In this detection method, a detection start point and a detection end point are set in advance in a pipeline where leakage should be detected, and a moving body is inserted from the detection start point and moved together with the liquid. Then, in the process of moving the moving body, the movement speed and the change in the movement direction or the change in the movement direction (hereinafter referred to as "change in the movement state") corresponding to the time, and the sound transmitted through the liquid are recorded and detected. After collecting the moving object at the end point, the leak position can be detected by the movement change data, the sound data, and the laying diagram of the pipeline.

At a curved portion, a cross-sectional area change portion, a valve portion, or the like in a pipeline, the flow velocity and flow direction of the liquid, or the flow direction changes. Therefore, by detecting the change in the moving speed and the moving direction of the moving body or the change in the moving direction and recording it together with the detection time, and comparing this record with the laying drawing, the moving body in the laying drawing can be recorded. You can know the passing time.

In addition, the sound transmitted via the liquid in the moving process of the moving body (hereinafter referred to as "transmitted sound") is collected and recorded in correspondence with the time. Then, by associating the passing time of the moving body with the sound collecting time in the laying drawing, the leakage position in the pipeline can be estimated.

The leak detection device according to the present invention is a sound collecting member that collects transmitted sound, a recording member that records the sound collected by the sound collecting member, and a change in the moving speed, moving direction, or moving direction of the moving body. An accelerometer and a clock, which sense and record the sound, are arranged. Therefore, the leak detection method according to the present invention can be implemented.

It is a schematic diagram explaining the leakage detection method which concerns on 1st Embodiment. It is a schematic diagram explaining the structure of the leakage detection device which concerns on this Example. It is a schematic diagram explaining the leakage detection method which concerns on 2nd Embodiment.

Hereinafter, the leak detection method according to the present invention will be described. The leak detection method according to the present invention is for detecting the presence or absence of a leak in a pipeline through which a liquid flows and, if a leak has occurred, the position thereof. In particular, when detecting the leak position, the change in the moving state of the moving body in the pipeline corresponding to the time with respect to the standard time is recorded and the transmission sound is recorded, and these records and the laying diagram of the pipeline are recorded. The leaked part is detected by matching the two.

The pipeline through which the liquid with pressure flows is not laid in a straight line from the start point to the end point of the pipeline, but is a two-dimensional or three-dimensional curved part, a part where the cross-sectional area changes, etc. , The flow velocity and the direction of the flow, or a plurality of portions where the direction of the flow changes (flow change portion). In particular, siphons that pass underneath water pipe bridges and rivers have three-dimensional changes. In addition, valve plugs for removing air caught in the pipeline are arranged at substantially constant intervals. The positions of such flow change portions, valve plug portions, and the like are described in the laying diagram of the target pipeline.

For this reason, first, for the pipeline in which leakage should be detected, the valve plug portions that serve as the detection start point and the detection end point are set, and these valve plug portions are specified on the laying diagram. Then, the moving body is inserted from the valve plug portion set as the detection start point and moved together with the liquid, and the change in the moving state that occurs when the moving body passes through the flow change portion is detected and recorded in accordance with the time. do.

Furthermore, after collecting the moving body at the detection end point, the order of the recorded parts where the moving state has changed and the flow changing part are compared with the laying diagram, so that the moving body has passed through the flow changing part in order from the upstream side. It is possible to know. That is, it is possible to know the passing time for the flow changing portion arranged in order from the upstream side from the record of the time history when the moving state of the moving body changes. Then, the moving speed of the moving body during this period can be known from the passing time of the flow changing portion on the upstream side, the passing time of the flow changing portion adjacent to the downstream side, and the distance between the two flow changing portions.

In addition, by recording the transmitted sound in correspondence with the time in the process of the moving body moving in the pipeline, and comparing this recording with the recording of the moving position corresponding to the time of the moving body moving in the pipeline. It is possible to detect the leaked part in the pipeline on the laying drawing. In particular, from the time when the transmitted sound was recorded, the moving speed of the moving object at this time, and the time when it passed the flow changing part on the upstream side, the position where the transmitted sound was detected from the flow changing part on the upstream side. By calculating the distance to, it is possible to detect the leak position with higher accuracy.

Therefore, the change in the moving state of the moving body inserted in the pipeline and the recorded sound are recorded in correspondence with the time based on the standard time, and the recorded time and the recorded time and the laying diagram of the pipeline are recorded respectively. By matching the above, it is possible to detect the position of the flow change portion through which the moving body has passed and the leakage position occurring in the pipeline with high accuracy.

As described above, in the leak detection method according to the present invention, both are detected and recorded at each time with respect to the standard time, that is, a change in the moving state of the moving body and a collection of transmitted sounds. Associated. That is, the moving speed between adjacent flow changing parts is calculated by detecting the time when the moving body passes through the flow changing part described in the laying diagram of the target pipeline from the record of the change in the moving state. Is possible. Then, the time when the transmitted sound is collected is compared with the time when the moving body before and after the time passes through the flow changing part, and the position where the transmitted sound is collected from the moving speed between these flow changing parts (leakage position). ) Can be specified.

In the leak detection method according to the present invention, the positions of the detection start point and the detection end point set in the target pipeline are not limited, and correspond to the detection history in the pipeline so far. It is preferable to set it appropriately.

Further, in the leak detection method according to the present invention, a monitoring point is set between the detection start point and the detection end point set in the pipeline, and a monitoring device is arranged at this monitoring point to move inside the pipeline. It is preferable to configure it so that it can detect that the passage has passed. The monitoring device may have a function of recognizing an object circulating inside the pipeline, and does not limit the monitoring method or structure. As a device having such a function, a device that irradiates light in a fan shape and senses and monitors the reflected light, a device that transmits ultrasonic waves and detects and monitors the reflected ultrasonic waves, and an image of the inside of a pipeline. There are a device for monitoring the sound wave, a device for transmitting the sound wave from the moving body, and a device for receiving and monitoring the sound wave, and any of them can be used.

Therefore, it is possible to reliably detect the passage of the monitoring point of the moving object that has moved along the pipeline by the monitoring device, and as a result, it is possible to accurately detect the time when the moving object has passed the monitoring point. Is. Therefore, it is possible to accurately detect the time when the moving body moves in the pipeline and passes through the monitoring point, and the leakage position can be detected by comparing the detected time with the laying diagram of the pipeline. Is possible.

A first embodiment of the leak detection method according to the present invention will be described with reference to FIG. As mentioned above, the pipeline through which a liquid with pressure flows generally has a length of several kilometers to several tens of kilometers, and has a two-dimensional and three-dimensional bend according to the surrounding terrain and environment. Has a part. FIG. 3A is a laying diagram of a pipeline for which leakage should be detected (hereinafter, the pipeline or the laying diagram is indicated by reference numeral A), and is a three-dimensional bend among a plurality of bends arranged in the conduit A. It is a schematic diagram which shows a part.

Further, FIG. 1 (b) is a diagram showing a record of collecting transmitted sounds transmitted via a liquid, and FIG. 1 (c) is a diagram showing a record of changes in the moving state of a moving body. 1 (d) is a diagram showing a time axis with respect to standard time.

As shown in FIG. 1A, a plurality of valve plug portions B (B1, B2, B3) are arranged in the pipeline A. Further, the pipeline A has a flow changing portion C (C1 to C3) including a plurality of curved portions in which the flow velocity of the liquid and the flow direction or the flow direction change, and a change portion in the cross-sectional area. Then, the distances L1 to L4 between the adjacent valve plug B and the flow change portion C can be measured on the laying diagram A.

It is assumed that a plurality of leakage portions D1, D2, and D3 exist in the pipeline A shown in FIG. 1A, and the present invention proposes a method for detecting the positions of these leakage portions D1 to D3. It is a thing.

Further, in the figure (a), t0 to t4 are flow changes of the valve plug portion B1 and the valve plug portion B2 in the pipeline A, and the respective flow changes arranged between the valve plug portions B1 and B2. It shows the time when the change of the flow state which occurred when passing through the parts C1 to C3 was recorded. Further, T1 to T3 indicate the time when the abnormal transmitted sound was recorded.

The valve plug portion B arranged in the pipeline A mainly has a function as an exhaust valve when the air entrained inside the pipeline A is discharged to the atmosphere, and has substantially the same distance from the pipeline A. There are multiple arrangements. These valve plug portions B are composed of a tube and a valve raised from the pipeline A, and it is possible to insert and remove a moving body into the conduit A, attach an autopsy device, and the like through this tube. be.

In the flow changing portions C1 and C2 formed of the curved portion formed in the pipeline A, the direction of the liquid flow changes from the side having a large curved shape to the side having a small curved shape. Therefore, the moving body that moves inside the pipeline A together with the liquid also changes the moving direction, and by detecting this change, it is possible to recognize that the moving body has passed through the curved portion.

Further, in the flow change portion C3 formed in the pipeline A in which the cross-sectional area has changed, the flow velocity of the liquid changes. Therefore, the moving speed of the moving body also changes, and by detecting this change, it is possible to recognize that the moving body has reached the flow changing portion C3 whose cross-sectional area changes.

When detecting the leakage of the pipeline A, first, the detection start point B1 and the detection end point B2 are set on the laying diagram A, and the position of the flow change portion C existing between the detection start point B1 and the detection end point B2, and The mutual distance between the detection start point B1, each flow change part C, and the detection end point B2 is measured. At this time, the distance from the detection start point B1 to the detection end point B2 is not limited, and may be several kilometers to several tens of kilometers.

After setting the detection start point B1 and the detection end point B2 in the pipeline A as described above, the moving body 10 is inserted into the pipeline A from the detection start point B1. In this operation, the moving body 10 is inserted into the pipeline A from the valve plug portion B1 while the moving body 10 is gripped by the gripping member 21, and is released when the moving body 10 reaches substantially the center of the pipeline A. .. The moving body 10 released from being gripped by the gripping member 21 moves in the pipeline A together with the liquid. Further, at the detection end point B2, a recovery member 22 for collecting the moving body 10 is arranged inside the pipeline A assuming the arrival time of the moving body 10.

The moving body 10 is configured to be able to detect a moving speed and a moving direction or a change in the moving direction (change in the moving state) and record the time corresponding to the time with respect to the standard time. In this embodiment, the change in the moving state can be sensed by the change in the three-dimensional acceleration acting on the moving body 10. Further, it is configured so that the transmitted sound transmitted via the liquid can be collected and recorded in correspondence with the time.

The moving body 10 measures the time based on the standard time before it is inserted into the pipeline A. Then, when the moving body 10 is inserted into the pipeline A from the valve plug portion B1 which is the detection starting point and starts moving to the downstream side together with the liquid, it senses the change in the initial moving state (change in moving speed). Will be. As a result, as shown in FIGS. 1 (c) and 1 (d), the peak 30 that senses the change in the moving state is recorded together with the time t0. At the same time, as shown in FIG. 1 (b), the transmitted sound is collected and recorded.

The moving body 10 that moves in the inside of the pipeline A together with the liquid records changes in the moving state (peaks 31 to 34) in accordance with the time t1 to t4 while detecting the change in the moving state (peaks 31 to 34) as the moving body 10 moves. Go. That is, changes in the moving speed of the moving body 10, changes in the posture of the moving body 10 in the horizontal plane, changes in the posture of the moving body 10 in the vertical plane, and changes in the sensed and sensed moving state. Record according to the time. At the same time, the transmitted sound collected is recorded according to the time.

Then, when the moving body 10 reaches the valve plug portion B2 which is the detection end point, it is collected by the recovery member 22 arranged in the valve plug portion B2. After that, the moving body 10 is taken out from the pipeline A, and the flow change data in which the change in the moving state is recorded and the sound data in which the transmitted sound is collected and recorded are taken out from the moving body 10.

The flow change data and the sound data taken out from the moving body 10 are arranged based on the elapsed time, collated with the laying diagram A, and the peak 30 that first senses the change in the moving state and the valve plug portion B1 that is the detection start point are arranged. Match and use as a reference, and match the flow change data with the laying diagram A. As a result, FIG. 1 (c) showing the flow change data displayed by the peak that sensed the change in the moving state, which corresponds to the time axis with respect to the standard time shown in FIG. 1 (d), collects the transmitted sound. FIG. 1 (b) showing the sound data displayed by the collected sound peak and FIG. 1 (a) which is the laying diagram A of the pipeline A are completed.

Then, from the figure, from the recognition that the peak 31 of the change in the moving state corresponds to the passage of the curved portion of the pipeline A, the peak 31 and the flow change portion C1, similarly, the peak 32, the flow change portion C2, and the peak 33. Recognizes that the peak 33 corresponds to the increase in the moving speed of the moving body 10, so that the peak 33 and the flow change portion C3, and the peak 34 and the valve plug portion B2 which is the detection end point are matched with each other, and the time corresponding to each peak 30 to 34 is reached. It is possible to correspond t0 to t4.

Further, the moving speed V1 (not shown) when the moving body 10 moves the distance L1 can be calculated from the distance L1 from the valve plug portion B1 to the flow changing portion C1 and the time from the time t0 to the time t1. It will be possible. Similarly, the moving speed V2 when the moving body 10 moves the distance L2, the moving speed V3 when moving the distance L3, and the moving speed V4 when moving the distance L4 are calculated.

Therefore, it is possible to confirm the moving position of the moving body 10 that changes from moment to moment. The moving speeds V1 to V4 when the moving body 10 moves the distances L1 to L4 do not always have the same value.

At times T1, T2, and T3 corresponding to the sound collection peaks 41, 42, and 43 displayed in FIG. 1 (b) showing the sound data in which the transmitted sound is recorded, each sound collection peak 41 to 43 is in the pipeline A. It is possible to roughly recognize the position to be removed. That is, the sound collecting peak 41 is located between the flow changing part C1 and the flow changing part C2, the sound collecting peak 42 is located between the flow changing part C2 and the flow changing part C3, and the sound collecting peak 43 is the flow. It is possible to recognize that it is located between the changing portion C3 and the flow changing portion C4.

In this way, the positions of the pipelines A corresponding to the sound collecting peaks 41 to 43 can be recognized as the leakage portions D1 to D3. However, in this case, it is based on the time when the moving body 10 passes through the flow changing portions C1 to C3 and the time when it reaches the valve plug portion B2, and the distance X1 from the adjacent flow changing portions C1 to C3. ~ X3 is not clarified.

Therefore, the distances X1 to X3 from the flow changing portions C1 to C3 located on the upstream side are calculated by using the already calculated moving speed of the moving body 10. That is, the sound collecting peak 41 is located between the flow changing portion C1 and the flow changing portion C2, the moving speed of the moving body 10 during this time is V1, and the time when the moving body 10 passes through the flow changing portion C1 is t1. Since the time of the sound peak 41 is T1, the distance X1 is calculated by the time from the time t1 to the time T1 and the moving speed V1. As a result, it is possible to detect the leaked portion D1 assuming that the leaked portion D1 that generated the sound collecting peak 41 exists on the downstream side by the distance X1 from the flow changing portion C1.

Similarly, it is possible to detect that the leak portion D2 exists on the downstream side by the distance X2 from the flow change portion C2 and that the leak portion D3 exists on the downstream side by the distance X3 from the flow change portion C3.

Next, a second embodiment of the leak detection method according to the present invention will be described with reference to FIG. The same parts as those in the above-described embodiment or the parts having the same functions are designated by the same reference numerals, and the description thereof will be omitted.

This embodiment is the same as the above-described embodiment in that the valve plug portion B1 arranged in the pipeline A is set as the detection start point and the valve plug portion B2 is set as the detection end point. Then, the monitoring device 23 is arranged in the valve plug portion B3 selected from the plurality of valve plug portions arranged between the valve plug portions B1 and the valve plug portion B2 to monitor the inside of the pipeline A. , It is configured so that the passage of the moving body 10 can be confirmed and the accurate time when the moving body 10 has passed the valve plug portion B3 can be measured.

The configuration of the monitoring device 23 is not particularly limited, and for example, ultrasonic waves can be transmitted in a plurality of directions at different angles in the circumferential direction within the vertical cross section of the conduit A and the reflected waves can be received. It is possible to configure. In this case, it is possible to monitor the line A by receiving the reflected wave when the moving body 10 crosses the ultrasonic wave transmitted in the line A.

In this embodiment, an ultrasonic wave transmitting device 12 described later is attached to the moving body 10 so that the inside of the pipeline A can be monitored by receiving the transmitted ultrasonic waves. Therefore, the monitoring device 23 includes a receiving unit 23a arranged inside the pipeline A, a clock that ticks the time based on the standard time, a recording member that records the sound received by the receiving unit 23a, and the like. It is composed of 23b.

Then, as shown in FIG. 3 (e), when the moving body 10 is detected by the monitoring device 23, the control unit 23b records the detection peak 51 corresponding to the time t5. Therefore, it is possible to reset the time t5 as the reference time when detecting the flow change portion C located on the downstream side of the valve plug portion B3.

Next, the configuration of the leak detection device E according to the present invention, which is advantageous to be used when implementing the leak detection method as described above, will be described with reference to FIG. The moving body 10 constituting the leak detecting device E moves along the substantially center of the pipe line A together with the liquid flowing through the pipe line A, senses and records the change in the moving state, and collects the transmitted sound. And record.

The configuration of the moving body 10 that moves along the substantially center of the pipeline A is not particularly limited, but it is preferable to set the specific gravity of the moving body 10 to an appropriate value with respect to the specific gravity of the liquid. For example, by setting the specific gravity of the moving body 10 to be substantially the same as the specific gravity of the liquid, it is possible to move the moving body 10 along substantially the center of the pipeline A. In this case, it is preferable that the liquid flowing through the pipeline A maintains a laminar flow state. Further, the moving body 10 can be moved along substantially the center of the pipeline A by setting the specific gravity to be slightly smaller than the specific gravity of the liquid and attaching the specific gravity adjusting member to the outer periphery.

The shape of the moving body 10 is not particularly limited, and it is preferably a cylindrical body having a length capable of accommodating each member to be arranged inside. The shape of the front and rear ends is preferably spherical. Further, although the dimensions are not limited, it is necessary to have an outer diameter sufficiently smaller than the inner diameter of the target pipeline A, and it is necessary to have a dimension that can easily pass through the valve plug portion B. Is. Since the tube constituting the valve plug portion B usually has a diameter of 75 mm, the outer diameter of the moving body 10 is preferably about 50 mm to 70 mm. The length is preferably about 100 mm to about 200 mm, although it corresponds to the configuration of the member to be accommodated.

In particular, in the moving body 10, in order to stabilize the posture when moving inside the pipeline A, it is preferable to arrange the devices housed therein so that the weight is concentrated in the lower part. By arranging in this way, it is possible to reduce the rolling that may occur during movement.

Further, when the moving body 10 passes through a curved portion in the horizontal direction or the vertical direction which is the flow changing portion C formed in the pipeline A, the moving body 10 is rotated in the horizontal direction or the vertical direction. Moving. Therefore, it is possible to detect that the moving body 10 has passed through the curved portion by sensing the change in the moving state at this time. Further, when the pipeline A branches in two or three directions, the flow velocity of the liquid changes. Therefore, it is possible to detect that the moving body 10 has passed the branch portion of the pipeline A by sensing the change in the moving state at this time.

When the moving body 10 moves inside the pipe line A, there is a possibility that the moving body 10 comes into contact with the pipe wall at a bent portion or the like formed in the pipe line A. Therefore, it is preferable that a cushion material is arranged on the outer peripheral surface of the moving body 10. This cushion material has a function of alleviating an impact on devices housed inside the moving body 10, and is not limited to a material or the like as long as it can exhibit such a function.

The configuration of the sound collecting member for collecting the transmitted sound arranged in the moving body 10 and the recording member for recording the sound collected by the sound collecting member is not particularly limited, and the configuration is not particularly limited, and the configuration is not particularly limited, and the configuration is not particularly limited, and the configuration is not particularly limited, and the configuration is not particularly limited. Any microphone and recording member capable of reliably collecting the transmitted sound may be used. Only one set of such sound collecting members and recording members is required. However, the sound generated in the pipe line A is often reflected on the pipe wall or the like and does not generate a clear peak. Therefore, it is preferable to arrange two sets of sound collecting members having different directivity and two sets of recording members corresponding to the respective sound collecting members.

It is preferable that the moving body 10 is provided with a continuous sound wave transmitting member that continuously transmits sound waves toward the outside. The configuration of this continuous sound wave transmitting member is not particularly limited, and may be a normally used sound wave transmitting member. However, it is preferable to transmit sound waves in a radial manner so that the monitoring device 23 arranged in the valve plug portion B can reliably receive the continuous dial tone. Therefore, it is preferable to use a continuous sound wave transmitting member formed in a ring shape on the moving body 10.

The monitoring device 23 arranged in the valve plug portion B has a function of receiving and recording a continuous dial tone transmitted from the mobile body 10. In particular, it is necessary to be able to reliably receive the continuous dial tone when the moving body 10 moves in the pipeline A and faces the valve plug portion B. Therefore, it is not particularly limited as long as it has such a function.

A standard clock is arranged in the leak detection device E, and the recording member arranged in the moving body 10 to record the sound data of the collected sound and the monitoring device 23 arranged in the valve plug portion B are based on the standard time. Is controlled as. That is, the recording member arranged on the moving body 10 at the same time collects the transmitted sound and records the sound data, and the sound wave reception recording member 2 receives and records the continuous dial tone transmitted from the moving body 10. It is configured to get.

In this embodiment, the liquid flowing through the pipeline A maintains a laminar flow state.

When the moving body 10 is inserted into the pipeline A in which the liquid flows in the laminar flow state, the moving body 10 moves along the substantially center of the pipeline A along with the liquid flowing in the laminar flow state. Then, in the process of the moving body 10 moving along the substantially center of the pipeline A, it is possible to collect and record the sound generated from the liquid.

The configuration of the leak detection device A according to this embodiment will be described with reference to FIG. The moving body 10 constituting the leak detection device E has a main body 10a which is formed of a metal or plastic such as aluminum and has a cylindrical and smooth outer peripheral surface, and a cap 10b which has a hemispherical and smooth outer peripheral surface. ing. When the cap 10b is attached to the main body 10a via a packing (not shown), an accommodation space 10c for accommodating the equipment necessary for detecting the leakage of the pipeline is formed inside. Therefore, the accommodation space 10c of the moving body 10 is configured as a closed space.

In this embodiment, two sets of sound collecting members and recording members are arranged in the accommodation space 10c formed in the moving body 10. That is, the moving body 10 is provided with a sound collecting microphone 11a that constitutes a sound collecting member in the front and rear, and a recorder 11b that records the sound collected by the sound collecting microphone 11a. In particular, one of the sound collecting microphones 11a is arranged on the end side of the moving body 10 on the downstream side in the moving direction and has directivity toward the downstream side. Further, the other sound collecting microphone 11a is arranged on the upstream end side of the moving body 10 and has directivity toward the upstream side.

A band-shaped continuous sound wave transmitting member 12 is arranged so as to be attached along the inner peripheral surface to the accommodation space main body 10c formed in the moving body 10. Therefore, it is possible to transmit sound waves radially to the outside of the moving body 10. The frequency and intensity of the transmitted sound wave are not limited, and it is preferable to appropriately set them according to conditions such as the thickness of the conduit A and the properties of the flowing liquid.

Further, in the accommodation space 10c, a sound collecting microphone 11a, a recorder 11b, a control unit 13 for controlling a continuous sound wave transmitting member 12, and a power supply 14 are arranged. Further, in the accommodation section 10c, a standard clock 15a, which is a reference for controlling the moving body 10, and a change in the moving speed and the moving direction of the moving body 10 or a change in the moving direction can be sensed and recorded. An accelerometer 15b is arranged.

A monitoring device 23 constituting the leak detection device E is arranged in the valve plug portion B3 selected from the valve plug portions arranged in the pipeline A. The monitoring device 23 includes a sound wave reception recording member, a reception unit 23a configured by a microphone for receiving sound waves, and a control unit 23b that records the sound waves received by the reception unit 23a and has a standard clock. It is composed of.

The receiving unit 23a is attached to a position where sound waves continuously transmitted from a moving body 10 moving in a pipeline A such as a valve or a pipe constituting the valve plug portion B3 can be satisfactorily received. In particular, the position where the receiving unit 23a is attached is preferably the intersection of the pipe constituting the valve plug portion B3 and the main pipe constituting the pipeline A.

In the leak detection device E configured as described above, the moving body 10 is the control unit 13 and the valve plug portion B3 of the moving body 10 prior to being inserted into the pipeline A from the valve plug portion B1 which is the detection starting point. Each control by the control unit 23b of the monitoring device 23 arranged in the above is started.

The moving body 10 inserted into the pipeline A moves in the pipeline A, senses a change in the moving state by the accelerometer 15b, and records the change corresponding to the time. At the same time, the transmitted sound is collected by the sound collecting 11a, and the collected transmitted sound is recorded by the recorder 11b in accordance with the time. Further, the sound wave is continuously transmitted radially from the continuous sound wave transmitting member 12 to the outside.

After that, as described in the first embodiment described above, when the moving body 10 inserted into the pipeline A passes through the flow change portion C on the downstream side, the accelerometer 15b senses the change in the flow state and peaks. Record 30-34. At the same time, when the moving body 10 passes through the leaking portion D, the microphone 11a collects the transmitted sound from the leaking portion D and records it in the recorder 11b in accordance with the time.

In particular, when the moving body 10 passes through the valve plug portion B3, when the receiving unit 23a of the monitoring device 23 arranged in the valve plug portion B3 receives and receives the continuous sound wave transmitted from the moving body 10. The reception peak 51 of the above is stored in the control unit 23b in correspondence with the time.

Then, when the moving body 10 reaches the valve plug portion B2 set at the detection end point of the pipeline A, it is recovered by the recovery member 22 and detached from the conduit A, and the procedure is the same as that of the first embodiment described above. It is possible to detect the presence or absence of leakage in the pipeline A and the leakage portions D1 to D3.

The leak detection method and the leak detection device of the present invention can be used for a pipeline for water and a pipeline for oil as long as it is a pipeline through which a liquid having pressure flows. In particular, it is sufficient to use the valve plugs at the detection start point and the detection end point from among the many valve plugs arranged in the pipeline, and it is possible to easily perform the leak detection work.

A pipeline, laying diagram B, B1 to B3 valve plugs (B1 detection start point, B2 detection end point)
C, C1 to C3 Flow change part D, D1 to D3 Leakage part E Leakage detection device L1 to L4, X1 to X3 Distance t0 to t5, T1 to T3 Time 10 Moving body 10a Main body 10b Cap 10c Containment space 11a Sound collecting microphone 11b Recorder 12 Continuous sound wave transmitter 13 Control unit 14 Power supply 15a Standard clock 15b Accelerometer 21 Grip member 22 Recovery member 23 Monitoring device 23a Receiver 23b Control unit 31-34 Peak that records changes in moving state 41-43 Sound collection peak 51 Detection peak

Claims (7)

The flow velocity and flow direction of the liquid such as the cross-sectional area change part or valve part where the two-dimensional or three-dimensional curved part or the cross-sectional area changes due to the flow of the liquid with pressure while being buried in the ground, or It has a flow change part that changes the direction of the flow, and sets the detection start point and detection end point for the pipeline that should detect the leakage of liquid.
It moves with a liquid with pressure, is configured to be able to record the movement speed and direction of movement at each time, or changes in the direction of movement, and collects the sound transmitted through the flowing liquid at each time. A moving body configured to be recordable is inserted from the detection origin of the conduit.
The movement speed and the movement direction of the moving body in the pipeline corresponding to the time from the detection starting point, or the change in the moving direction is recorded, and the sound transmitted through the liquid is collected and recorded. ,
After collecting the moving body at the detection end point of the pipeline, the moving speed and moving direction of the moving body recorded in the process of moving the moving body corresponding to the time, or the movement change data when the moving direction changes. A leak detection method comprising detecting a leak position in a pipeline based on sound data collected from sounds transmitted through a circulating liquid and a laying diagram of the pipeline. A monitoring point is set between the detection start point and the detection end point set in the pipeline, and the inside of the pipeline is monitored by a monitoring device arranged at the monitoring point.
The time when the monitoring device detects that the moving body has passed the monitoring point, and the moving speed, moving direction, or moving direction of the moving body recorded in the process of moving the moving body corresponding to the time. The claim is characterized in that the leakage position in the pipeline is detected by the flow change data when the flow changes, the sound data collected from the sound transmitted via the liquid, and the laying diagram of the pipeline. The leak detection method according to 1. The flow velocity and flow direction of the liquid such as the cross-sectional area change part or valve part where the cross-sectional area changes or the two-dimensional or three-dimensional curved part or the cross-sectional area changes when the liquid with pressure is circulated while being buried in the ground. A leak detection device for detecting leaks in a pipeline having a flow change portion in which the flow direction changes.
It has a moving body whose outer diameter is smaller than the inner diameter of the pipeline in which leakage should be detected and which moves with the liquid inside the pipeline.
Inside the moving body, there is a sound collecting member that collects the sound transmitted through the liquid when the liquid flows through the pipeline, and a recording member that records the sound collected by the sound collecting member. , And an accelerometer and a clock that sense and record the movement speed and the movement direction of the moving body, or the change in the movement direction, and the leak detection device. At a predetermined position along the laying direction of the pipeline in which the leakage should be detected, a clock synchronized with the clock placed on the moving body and the inside of the pipeline are monitored to detect the passage of the moving body. The leak detection device according to claim 3, wherein a detection member for recording a time when the passage of a moving body is detected and a detection member are arranged. The leak detection device according to claim 3, wherein the liquid having the pressure flows through the pipeline while maintaining a laminar flow state. A continuous sound wave transmitting member that continuously transmits sound waves to the outside is arranged on the moving body.
The leak detection device according to claim 4, wherein the monitoring device is provided with a sound wave reception / recording member that receives and records sound waves transmitted from the moving body. The leak detection according to claim 6, wherein the continuous sound wave transmitting member arranged on the moving body is configured to continuously transmit sound waves radially toward the inner peripheral surface of the pipeline. Device.

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