JP2015210225A - Water leakage monitoring system, water leakage monitoring method, water leakage monitoring device, and water leakage monitoring program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water leakage monitoring system, a water leakage monitoring method, a water leakage monitoring device, and a water leakage monitoring program capable of estimating a place of water leakage with improved accuracy.SOLUTION: A water leakage monitoring system includes a plurality of pressure gauges, a distance difference estimation section, and a water leakage place estimation section. The plurality of pressure gauges are installed at a plurality of places in a water distribution pipe network, and measure a water pressure at each of the plurality of places. The distance difference estimation section estimates distance difference between a place of water leakage and the plurality of pressure gauges on the basis of a change of the water pressure measured by each of the plurality of pressure gauges. The water leakage place estimation section estimates the place of the water leakage in the water distribution pipe network on the basis of the distance difference estimated by the distance difference estimation section.

Description

  Embodiments described herein relate generally to a water leakage monitoring system, a water leakage monitoring method, a water leakage monitoring device, and a water leakage monitoring program.

  The water purified at the waterworks treatment facility is supplied to a large number of customers distributed over a wide area through a distribution pipe network. Therefore, the water distribution network plays a role as a lifeline network necessary for maintaining the daily life of each consumer, and it is necessary to constantly respond to the water demand of each consumer with high reliability. There is. If a part of the water distribution pipes that make up the water distribution pipe network breaks, it will lead to disasters such as road collapses and floods. In addition to direct damage due to breakage, pipe cracks and water leaks due to breakage reduce the effective water volume (effective rate) relative to the total water distribution, so pipe cracks and breaks are detected as early as possible. It is desirable to do.

  Conventionally, for underground leaks in the distribution pipe network other than the above-ground leaks, which are informed by residents' notifications, etc., the field investigator regularly conducts a leak check (primary survey) using a hearing rod etc. As a result, a location with a high possibility of water leakage was identified, and then a detailed water leakage location in the area (secondary survey) was focused on using a correlative water leakage probe. In addition, in connection with this, a vibration meter is installed in the water distribution pipeline in advance, the leakage sound propagating through the pipeline is detected, and signal processing is performed on the information to identify the presence and location of leakage. How to do is known. However, in the conventional technology, there is a case where the water leak location cannot be accurately estimated.

JP 2004-125628 A

  The problem to be solved by the present invention is to provide a water leakage monitoring system, a water leakage monitoring method, a water leakage monitoring device, and a water leakage monitoring program that can estimate a water leakage location more accurately.

  The water leakage monitoring system of the embodiment has a plurality of pressure gauges, a distance difference estimation unit, and a water leakage location estimation unit. The plurality of pressure gauges are attached to a plurality of locations in the water distribution pipe network, and measure the water pressure at each of the plurality of locations. A distance difference estimation part estimates the distance difference from a water leak location to the said several pressure gauge based on the change of the water pressure each measured by the said several pressure gauge. A water leak location estimation part estimates the water leak location in the said water distribution pipe network based on the distance difference estimated by the said estimation part.

The figure which shows the structure of the water leak monitoring system 1 containing the water leak monitoring apparatus 10 which concerns on 1st Embodiment. The figure which shows an example of the data memorize | stored in the monitoring data storage part. The figure which illustrated the change of the flow rate and water pressure before and after the occurrence of water leakage. The figure which shows the relationship between a water leak location and the position of a pressure gauge. The figure which shows the hyperbola P which is a set (position where a water leak location exists) of the position estimated as a water leak location. The schematic diagram which shows a mode that a water leak location is estimated based on a hyperbola and pipeline network data. The figure which shows the structure of 1 A of water leak monitoring systems containing 10 A of water leak monitoring apparatuses which concern on 2nd Embodiment. The figure which shows the existing region of the water leak location estimated by 43 A of water leak location estimation parts which concern on 2nd Embodiment in the case of _dmin < _dmax <L. In the case of _{d min <L} <d _max, shows the existence region of water leakage points estimated by the water leakage position estimator 43A according to the second embodiment. The figure which shows the structure of the water leak monitoring system 1B containing the water leak monitoring apparatus 10B which concerns on 3rd Embodiment. The figure which shows the existing area of the water leak location estimated by the water leak location estimation part 43A which concerns on 2nd Embodiment in the case of 0 = _dmin < _dmax <L. The figure which shows the structure of 1 C of water leak monitoring systems containing 10 C of water leak monitoring apparatuses which concern on 4th Embodiment. The figure which shows an example of the relevant information memorize | stored by the data storage part 33 at the time of water leak generation | occurrence | production. The figure which shows a mode that the increase in the flow volume of the water measured with a flowmeter corresponds with the change pattern of the flow volume of the water memorize | stored by the specific event data storage part.

  Hereinafter, a water leakage monitoring system, a water leakage monitoring method, a water leakage monitoring device, and a water leakage monitoring program according to embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a water leakage monitoring system 1 including a water leakage monitoring device 10 according to the first embodiment. The water leakage monitoring system 1 includes a water leakage monitoring device 10, a flow meter 80-1 attached to a water distribution block WB-1 constituting a water distribution pipe network, and pressure gauges 90-1 (1), 90-1 (2). , 90-1 (...), A flow system 80-2 attached to the water distribution block WB-2 (detailed illustration omitted), and pressure gauges 90-2 (1), 90-2 (2), 90-2 (...) and a telemeter 100. The number after “-” in the code (excluding the parentheses) indicates which distribution block is attached. In addition, the number of the pressure gauges attached to each water distribution pipe network PN should just be two or more, and there is no upper limit. In this configuration, the water (purified water) stored in the distribution reservoir 70 is supplied to the distribution pipeline networks PN-1 and PN-2 including homes and offices by pumps and valves.

  The amount of water flowing into the distribution pipe network PN-1 is detected by the flow sensor 80-1. The flow sensor 80-1 transmits the detected amount of water to the water leakage monitoring device 10. The pressure gauges 90-1 (1) and 90-1 (2) are attached to different locations in the water distribution pipe network PN-1, and transmit the detected water pressure to the water leakage monitoring device 10.

  Similarly, the amount of water flowing into the distribution pipe network PN-2 is detected by the flow sensor 80-2. The flow sensor 80-2 transmits the detected amount of water to the water leakage monitoring device 10. The pressure gauges 90-2 (1) and 90-2 (2) are attached to different locations in the water distribution pipe network PN-2, and transmit the detected water pressure to the water leakage monitoring device 10.

  The telemeter 100 is used to collect flow rate / water pressure measurement data installed in each water distribution block. The telemeter 100 captures the flow rate and water pressure data measured by the flow meter installed in the water distribution block and each pressure gauge at a required cycle, converts the data into a data format suitable for the data transmission line, and then transmits the data transmission line. And transmitted to the water leakage monitoring device 10. In addition to wireless and wired data transmission lines, various transmission methods such as a public network and the Internet are conceivable, but dedicated lines laid for each flow meter and pressure gauge are used to reduce delay and the like. Therefore, it is desirable to transmit to the water leakage monitoring device 10 side.

  When the telemeter 100 receives the bit data of the flow meter and each pressure gauge, the telemeter 100 identifies the target of the distribution block and the flow meter and each pressure gauge in each distribution block based on the distribution block of the transmission source, and the target identification data The bit data of the measurement result including it is transmitted to the water leakage monitoring device 10. In addition, if the arrangement of the measurement order is determined in advance between the telemeter 100 and the water leakage monitoring device 10, the water leakage monitoring device 10 receives in advance a start (synchronization) signal transmitted from the telemeter 100 in advance. By receiving the bit data in the order of the determined distribution blocks, it is possible to grasp which distribution block, which flow meter, and each pressure gauge is the measurement data.

  Data transmitted from the telemeter 100 is processed by the data collection unit 20 and the data conversion unit 22 of the water leakage monitoring device 10 and stored in the monitoring data storage unit 30. Hereinafter, each functional unit of the water leakage monitoring apparatus 10 will be described. The water leakage monitoring device 10 includes, for example, a processor such as a CPU (Central Processing Unit) and a program memory such as an HDD and a flash memory. The water leakage monitoring device 10 includes, for example, a data collection unit 20, a data conversion unit 22, a monitoring data storage unit 30, a pipeline network data storage unit 31, a map data storage unit 32, and a change timing specification as functional configurations. A unit 40, a pressure gauge reaction time difference deriving unit 41, a distance difference estimating unit 42, a water leak location estimating unit 43, a water leak location display control unit 44, and a display unit 50 are provided. The data collection unit 20, the data conversion unit 22, the change timing identification unit 40, the pressure gauge reaction time difference derivation unit 41, the distance difference estimation unit 42, the water leak location estimation unit 43, and the water leak location display control unit 44 are stored in, for example, a program memory. It is a software function unit that functions when a CPU executes a stored program. Some or all of these functional units may be hardware functional units such as LSI (Large Scale Integration) and ASIC (Application Specific Integrated Circuit). The monitoring data storage unit 30 and the map data storage unit 32 are realized by a storage device such as a ROM, a RAM, a HDD (Hard Disk Drive), or a flash memory, for example. Note that some or all of the data collection unit 20, the data conversion unit 22, the monitoring data storage unit 30, the pipeline network data storage unit 31, and the map data storage unit 32 are devices separate from the water leakage monitoring device 10. It may be a function.

  The data collection unit 20 collects bit data including target specifying data regarding the flow meter and each pressure gauge in each water distribution block from the telemeter 100. When the data conversion unit 22 collects bit data related to the flow rate and pressure collected by the telemeter 100 at a constant cycle (for example, every 0.85 [sec]), the data conversion unit 22 performs calculation processing from each bit data of the 0.85 [sec] cycle. For example, 1 [sec] cycle, 5 [sec] cycle, and 1 [min] cycle, the flow rate data and the water pressure data are converted into the monitoring data storage unit 30 together with the reception time or transmission time after conversion. Remember.

  FIG. 2 is a diagram illustrating an example of data stored in the monitoring data storage unit 30. In the figure, what is described as “measurement subject” corresponds to the reference numerals of the flow meter and pressure gauge in FIG. In addition, “time” in the figure represents the reception time or the transmission time after being converted by the data conversion unit 22. That is, for each water distribution block, the flow rate data and the water pressure data are sequentially accumulated for each predetermined period, divided into a flow meter and a pressure gauge.

  The change timing specifying unit 40 monitors the data stored in the monitoring data storage unit 30 and specifies the rising timing of the flow rate. FIG. 3 is a diagram illustrating changes in flow rate and water pressure before and after water leakage occurs. The following description will be made on the assumption that the water distribution block WB-1 is being processed. For example, the “flow rate” is a value detected by the flow meter 80-1, the water pressure (1) is a value detected by the pressure meter 90-1 (1), and the water pressure (2) is a pressure meter 90-1. This is the value detected by 1 (2). As shown in the figure, when water leaks, water flows out, so that the flow rate increases and the water pressure decreases. The change timing specifying unit 40 specifies the rising timing of the flow rate and provides it to the pressure gauge reaction time difference deriving unit 41.

  For example, the change timing specifying unit 40 includes data of a flow rate that is increased by a predetermined value or more (or a predetermined ratio or more) compared to the previous data among the data accumulated in the monitoring data storage unit 30 at a predetermined cycle. The time of the flow rate data rising by a predetermined value or more (or a predetermined rate or more) compared with the previous data is specified as the flow rate rising timing. In the example of FIG. 3, the time T0 is specified as the flow rate rising timing.

  The pressure gauge reaction time difference deriving unit 41 derives a time difference (pressure gauge reaction time difference) ΔT when the water pressure (1) and the water pressure (2) are reduced. In the example of FIG. 3, it is considered that time T1 is a decrease timing of the water pressure (1) and time T2 is a decrease timing of the water pressure (2). The pressure gauge reaction time difference deriving unit 41 may identify the decrease timing by comparing the change in the individual water pressure with the threshold value, but the following method can be employed. That is, the pressure gauge reaction time difference deriving unit 41 extracts, for example, water pressure (1) and water pressure (2) data from when the flow rate rises T1 until a certain period of time WT elapses, while shifting the time between the data. A correlation function is obtained, and the amount of time shift when the correlation function becomes the largest is derived as a time difference ΔT in which the water pressure (1) and the water pressure (2) are reduced. Moreover, the pressure gauge reaction time difference deriving unit 41 may derive the time difference in which the water pressure has decreased by frequency time analysis represented by time Fourier transform and wavelet transform. As a result, the threshold value can be used as two indicators of the frequency component and the signal intensity, so that the parameters can be set more easily and the detection accuracy can be improved.

Based on the time difference derived by the pressure gauge reaction time difference deriving unit 41, the distance difference estimation unit 42 and the distance from the water leakage occurrence point to the pressure gauge 90-1 (1) and the pressure gauge 90-1 ( Estimate the distance difference up to 2). The distance difference estimation part 42 estimates the distance difference from a water leak location to each pressure gauge by multiplying the time difference derived by the pressure gauge reaction time difference deriving part 41 by the pressure propagation velocity α. The pressure propagation speed α propagating through the water pipe is determined based on, for example, the formula (1). Where α is the pressure propagation velocity, K is the bulk modulus (about 2.2 × 109 [Pa] for water), and ρ is the water density (1.0 × 103 [kg / m ³ ]). ), D is the pipe diameter [m], e is the wall thickness [m], and E is the longitudinal elastic modulus 1.6 × 1011 [Pa] (in the case of a ductile cast iron pipe). Regarding the pipe diameter, the wall thickness, and the longitudinal elastic modulus, representative values representing the water distribution pipe network are set. As the representative value, a value such as a statistical average value or median value of the distribution pipe network data may be used, or may be set based on empirical know-how possessed by the user. In addition, it is known that the water temperature is greatly related to the bulk modulus and density indicating the physical properties of water, but this may also be set using the water temperature at the time of measurement, know-how and representative You may set based on a value. This is because it is difficult to think that the pressure propagation velocity actually matches the value obtained by the theoretical formula, and an error is always included, and it is quite possible that the pressure response time difference also includes a measurement error. Therefore, using a huge amount of pipeline network data does not necessarily improve the estimation accuracy, but in reality, roughly estimating the leak location using representative values of pipeline network data that can be easily obtained. It is often more practical to do this. If data of the pipeline network cannot be obtained, a fixed value such as 700 [m / s] may be used as the pressure propagation velocity α.

  The water leak location estimation unit 43 estimates the water leak location based on the distance difference estimated by the distance difference estimation unit 42 under the assumption that the pressure propagates concentrically. FIG. 4 is a diagram illustrating the relationship between the water leakage location and the position of the pressure gauge. In the figure, P1 indicates the position of the pressure gauge 90-1 (1), and P2 indicates the position of the pressure gauge 90-1 (2). L is the distance between P1 and P2, and is a known value. When the distance difference estimated by the distance difference estimation unit 42 is d (P2 is farther from the leaked location), the distance from the leaked location to P1 is z (unknown value), from the leaked location to P1. The distance is z + d.

The leaking point satisfying that the distance from the leaking point to P1 is z and the distance from the leaking point to P1 is z + d is the position on the hyperbola represented by the equation (2). In the formula, x represents the x coordinate of the water leakage location, and y represents the y coordinate of the water leakage location. FIG. 5 is a diagram showing a hyperbola Q that is a set of positions that are estimated to be a water leak location (region where the water leak location exists).

  When the water leak location estimation unit 43 obtains the hyperbola, the water leak location estimation unit 43 estimates the water leak location based on the pipeline network data stored in the pipeline network data storage unit 31. In the pipeline network data storage unit 31, data indicating the arrangement of pipelines in the water distribution pipeline network, for example, data indicating the coordinates of nodes indicating branch points and corners, and which nodes are on both ends of the pipeline Etc. are stored. FIG. 6 is a schematic diagram showing a state in which a water leak location is estimated based on hyperbola and pipeline network data. As shown in the figure, the water leak location estimation unit 43 estimates the intersection of the derived hyperbola and the pipeline as the water leak location. In addition, the method concerned is an example, and when three or more pressure gauges are attached to the water distribution block, the water leakage location may be estimated by obtaining the intersection of the hyperbolas. Moreover, the water leak location estimation part 43 may estimate a water leak location further considering the time difference of the raise timing of flow volume, and the fall timing of water pressure.

  The water leak location display control unit 44 reads out data corresponding to the water leak location estimated by the water leak location estimation unit 43 from the map data stored in the map data storage unit 32, for example, a display image in which the water leak location is superimposed on the map. Is generated and displayed on the display unit 50. The generated display image is obtained by superimposing a building or road image on the image illustrated in FIG. 6, for example. The water leakage location display control unit 44 may generate a display image based on data provided from GIS (Geographic Information Systems). As the display unit 50, a display device such as an LCD (Liquid Crystal Display) or an organic EL (Electroluminescence) is used.

  According to the first embodiment described above, a plurality of pressure gauges 90-1 (1), 90-1 (2) and the like attached to different locations in the water distribution pipe network and a plurality of pressure gauges respectively. Based on the time difference in which the measured water pressure has decreased, a distance difference estimation unit 42 that estimates the distance difference from the water leakage location to the plurality of pressure gauges, and on the distribution pipe based on the distance difference estimated by the distance difference estimation unit By providing the water leak location estimation part 43 which estimates the water leak location in a net | network, a water leak location can be estimated more correctly.

(Second Embodiment)
Hereinafter, the second embodiment will be described. FIG. 7 is a diagram illustrating a configuration of a water leakage monitoring system 1A including a water leakage monitoring device 10A according to the second embodiment. In FIG. 7, illustration of the water distribution pipe network, the flow meter, and the pressure gauge is omitted. Compared with the first embodiment, the water leakage monitoring device 10A according to the second embodiment differs in the functions of the distance difference estimation unit 42A and the water leakage location estimation unit 43A, and other functions are different from those of the first embodiment. It is the same. Therefore, only differences from the first embodiment will be described here.

The distance difference estimation unit 42A according to the second embodiment provides an upper limit value α _max and a lower limit value α _min for the pressure propagation speed α, and uses these values to set the upper limit d _max and the lower limit d _min of the distance difference d. To derive. The upper limit value α _max and the lower limit value α _min of the pressure propagation speed α are determined, for example, by giving a width to an arbitrary term in the equation (1). Selection of a term having a width and setting of the width are configured to be input by a user, for example.

The water leakage position estimator 43A according to the second embodiment, a hyperbola based on the upper limit d _max of the distance difference d, the hyperbolic based on the lower limit d _min of the distance difference d generated respectively, interposed between the generated two hyperbolas Area is estimated as the existence area of the water leak location. The existence area of the water leakage location is different between (A) d _min <d _max <L and (B) d _min <L <d _max . FIG. 8 is a diagram illustrating a region where a water leak location is estimated by the water leak location estimation unit 43A according to the second embodiment when d _min <d _max <L. In the figure, the area indicated by diagonal lines corresponds to the existence area of the water leakage location. FIG. 9 is a diagram illustrating a region where a water leak location is estimated by the water leak location estimation unit 43A according to the second embodiment when d _min <L <d _max . In addition, in the case of L <d _min <d _max , it is not possible to narrow down the existence area of the water leakage location.

  Furthermore, the water leakage location estimation unit 43A estimates the water leakage location based on the pipeline network data stored in the pipeline network data storage unit 31, or has a pressure gauge in the water distribution block as in the first embodiment. When two or more are attached, the leak location is estimated by obtaining the overlapping portion of the leak locations. Further, the water leak location estimation unit 43A may further estimate the water leak location by taking into account the time difference between the flow rate increase timing and the water pressure decrease timing.

  According to the second embodiment described above, the same effect as in the first embodiment can be obtained, and by providing a wide range of the estimation result, the existence range of the water leakage location can be widened. It is possible to call attention without omission.

(Third embodiment)
Hereinafter, a third embodiment will be described. FIG. 10 is a diagram illustrating a configuration of a water leakage monitoring system 1B including a water leakage monitoring device 10B according to the third embodiment. In FIG. 10, illustration of the water distribution pipe network, the flow meter, and the pressure gauge is omitted. The water leakage monitoring device 10B according to the third embodiment is different from the second embodiment in the functions of the pressure gauge reaction time difference deriving unit 41B and the distance difference estimating unit 42B, and the other functions are the second embodiment. It is the same as the form. Therefore, only differences from the second embodiment will be described here.

The pressure gauge reaction time difference deriving unit 41B according to the third embodiment derives the upper limit values ΔT _max and ΔT _min for the time difference ΔT in which the water pressure measured by the plurality of pressure gauges has decreased. The time difference ΔT includes an error in obtaining a correlation function between data or performing frequency time analysis. Assuming that this error is 10 [%], the upper limit values ΔT _max and ΔT _min are obtained by equations (3) and (4).
ΔT _max = ΔT × 1.1 (3)
ΔT _min = ΔT × 0.9 (4)

The error of the time difference ΔT can also be obtained by adding and subtracting a fixed value (Equations (5) and (6)). In the formula, β is a fixed value. Further, β may be a variable value that varies based on some information.
ΔT _max = Max (ΔT + β, 0) (5)
ΔT _min = Max (ΔT−β, 0) (6)

The distance difference estimation unit 42B according to the third embodiment applies the upper limit value α _max and the lower limit value α _min of the pressure propagation velocity α based on the upper limit values ΔT _max and ΔT _min , respectively, and the upper limit of the distance difference d. d _max and the lower limit d _min are derived. The distance difference estimation unit 42B derives the following _four distance differences d ₁ , d ₂ , d ₃ , and d ₄ (Equations (7) to (10)), and the largest one among them is the distance difference d. to the derived limit _{d max,} the smallest lower limit _{d min.} About the function of the water leak location estimation part 43A, it is as having demonstrated in 2nd Embodiment.
d ₁ = α _min × ΔT _min (7)
d ₂ = α _min × ΔT _max (8)
d ₃ = α _max × ΔT _min (9)
d ₄ = α _max × ΔT _max (10)

The existence area of the water leak location estimated by the water leak location estimation unit 43A is as follows in the second embodiment when (A) d _min <d _max <L and (B) d _min <L <d _max. This is the same as described with reference to FIGS. In the third embodiment, in addition to this, (C) 0 = d _min may be satisfied. FIG. 11 is a diagram illustrating a region where a water leak location is estimated by the water leak location estimation unit 43A according to the second embodiment when 0 = d _min <d _max <L.

  According to the third embodiment described above, the same effect as that of the first embodiment can be obtained, and the existence range of the water leakage location can be widened by giving the estimation result more width, and the water leakage location It is possible to call attention without omission.

  In the third embodiment, the upper limit value and the lower limit value are obtained for both the time difference ΔT and the pressure propagation speed α. However, the upper limit value and the lower limit value may be obtained only for the time difference ΔT.

(Fourth embodiment)
Hereinafter, a fourth embodiment will be described. FIG. 12 is a diagram illustrating a configuration of a water leakage monitoring system 1C including a water leakage monitoring device 10C according to the fourth embodiment. Although the figure shows a state in which the additional function described below is added to the first embodiment, the additional function may be added to the second or third embodiment.

  The water leakage monitoring device 10C according to the fourth embodiment includes a delay time of the water pressure decrease timing measured by the plurality of pressure gauges at the time of past water leakage with respect to the water flow rising timing measured by the flow meter. A data storage unit 33 that stores information related to the location of the water leak and a change pattern of the flow rate of water measured by the flow meter when a specific event such as introduction of water into the water receiving tank occurs Specific event data storage unit 34.

  And the water leak location estimation part 43 considers the related information memorize | stored by the data storage part 33 at the time of water leak occurrence, and estimates the water leak location in a water distribution pipe network. FIG. 13 is a diagram illustrating an example of relation information stored by the data storage unit 33 when a water leak occurs. As shown in the figure, in the data storage unit 33 at the time of occurrence of water leakage, a delay time (reaction time difference) of the water pressure lowering timing with respect to the water distribution block, flow rate, flow rate rising timing, etc. Is remembered. After deriving the existence area of the water leak location, the water leak location estimation unit 43 determines whether or not there has been a past water leak event showing a similar pressure change, and there has been a past water leak event showing a similar pressure change. In this case, it is determined that the past water leakage location is close to the current water leakage location, and the water leakage location is estimated. Thereby, a water leak location can be estimated more accurately.

  Moreover, the water leak location estimation unit 43 determines that there is no water leak when the increase in the water flow rate measured by the flow meter matches the change pattern of the water flow rate stored by the specific event data storage unit 34. Do not estimate the location of water leakage. FIG. 14 is a diagram illustrating a state in which the increase in the water flow rate measured by the flow meter matches the water flow rate change pattern stored in the specific event data storage unit 34. Thus, it is possible to prevent the user from being bothered by performing unnecessary estimation.

  In the fourth embodiment, when there is a past water leakage event showing a similar pressure change, the function of estimating the water leakage location by determining that the past water leakage location is close to the current water leakage location, and a flow meter When the measured increase in the water flow rate matches the change pattern of the water flow rate stored in the specific event data storage unit 34, it is determined that there is no water leakage, and the function of not estimating the water leakage location Only one of them may be provided.

  The pressure gauge reaction time difference deriving unit 41 in each of the above embodiments is an example of a “time difference deriving unit”.

  According to at least one embodiment described above, the distance difference estimation unit 42 that estimates the distance difference from the water leakage location to the plurality of pressure gauges based on the time difference in which the water pressure measured by each of the plurality of pressure gauges has decreased. By having the water leak location estimation unit 43 that estimates the water leak location in the water distribution pipe network based on the distance difference estimated by the distance difference estimation unit 42, the water leak location can be estimated more accurately.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Water leak monitoring system 10, 10A, 10B, 10C ... Water leak monitoring apparatus, 20 ... Data collection part, 22 ... Data conversion part, 30 ... Monitoring data storage part, 31 ... Pipe network data storage part, 32 ... Map data Storage unit 33 ... Data storage unit at occurrence of water leakage, 34 ... Specific event data storage unit, 40 ... Change timing specification unit, 41, 41B ... Pressure gauge reaction time difference deriving unit, 42, 42A, 42B ... Distance difference estimation unit, 43 , 43A ... Leakage location estimation unit, 44 ... Leakage location display control unit, 50 ... Display unit, 70 ... Reservoir, 80-1, 80-2 ... Flow meter, 90-1 (1), 90-1 (2) , 90-2 (1), 90-2 (2) ... pressure gauge, 100 ... telemeter

Claims (13)

A plurality of pressure gauges attached to a plurality of locations in the water distribution pipe network and measuring the water pressure of each of the plurality of locations;
A distance difference estimation unit that estimates a distance difference from a water leakage point to the plurality of pressure gauges based on a change in water pressure measured by each of the plurality of pressure gauges;
Based on the distance difference estimated by the distance difference estimation unit, a water leakage point estimation unit that estimates a water leakage point in the water distribution pipe network,
Water leakage monitoring system comprising. The distance difference estimation unit estimates a distance difference from a water leakage point to the plurality of pressure gauges based on a time difference in which the water pressure measured by each of the plurality of pressure gauges is reduced.
The water leakage monitoring system according to claim 1. The water leak location estimation unit generates a virtual hyperbola corresponding to the distance difference estimated by the distance difference estimation unit, estimates a water leak location existing area based on the generated virtual hyperbola, and the estimation In the presence area of the leaked water location, the water leak location in the water distribution pipe network is estimated,
The water leakage monitoring system according to claim 1 or 2. The water leak location estimation unit estimates a water leak location in the water distribution pipeline network based on the estimated area of the water leak location and the arrangement information of the water distribution pipeline network.
The water leakage monitoring system according to claim 3. The distance difference estimating unit derives an upper limit value and a lower limit value of the distance difference by multiplying the time difference by an upper limit value and a lower limit value, respectively, of the pressure propagation velocity,
The water leakage location estimation unit generates virtual hyperbola corresponding to the upper limit value and the lower limit value of the distance difference estimated by the distance difference estimation unit, and the region sandwiched by the generated hyperbola is the presence of the water leakage location. Estimate as a region,
The water leakage monitoring system according to claim 3 or 4. A time difference deriving unit for deriving the time difference, comprising a time difference deriving unit for deriving an upper limit value and a lower limit value of the time difference;
The distance difference estimation unit derives an upper limit value and a lower limit value of the distance difference by multiplying each of an upper limit value and a lower limit value of the time difference by a pressure propagation speed,
The water leakage location estimation unit generates virtual hyperbola corresponding to the upper limit value and the lower limit value of the distance difference estimated by the distance difference estimation unit, and the region sandwiched by the generated hyperbola is the presence of the water leakage location. Estimate as a region,
The water leakage monitoring system according to any one of claims 3 to 5. A flow meter for measuring the flow rate of water flowing into the water distribution network;
A time difference deriving unit that extracts the water pressure measured by the plurality of pressure gauges in a certain period from the rising timing of the water flow rate measured by the flow meter, and derives the time difference based on the extracted water pressure;
A water leakage monitoring system according to any one of claims 1 to 6. A map data storage unit for storing map data;
A water leakage location display control unit that displays on the display unit a display screen in which information on the water leakage location estimated by the water leakage location estimation unit is superimposed on a map based on the map data;
A water leakage monitoring system according to any one of claims 1 to 7. A flow meter for measuring the flow rate of water flowing into the water distribution network;
The occurrence of water leakage that stores the relationship between the delay time of the water pressure decrease timing measured by the plurality of pressure gauges at the time of the past water leakage occurrence with respect to the water flow increase timing measured by the flow meter and the location of the water leakage Equipped with a time data storage unit,
The water leak location estimating unit estimates the water leak location in the water distribution pipe network in consideration of the relationship information stored by the data storage unit at the time of water leak occurrence,
The water leakage monitoring system according to any one of claims 1 to 8. A flow meter for measuring the flow rate of water flowing into the water distribution network;
A specific event data storage unit that stores a change pattern of the flow rate of water measured by the flow meter when a specific event occurs,
When the change pattern of the water flow rate measured by the flow meter matches the change pattern of the water flow rate stored by the specific event data storage unit, the location of water leakage in the water distribution pipe network is estimated. do not do,
The water leakage monitoring system according to any one of claims 1 to 9. With a plurality of pressure gauges attached to a plurality of locations in the water distribution pipe network, measure the water pressure of each of the plurality of locations,
Based on the change in water pressure measured by each of the plurality of pressure gauges, estimate the difference in distance from the water leakage point to the plurality of pressure gauges,
Based on the estimated distance difference, estimate a water leak location in the water distribution network,
Water leakage monitoring method. A distance for estimating a distance difference from a water leakage point to each of the pressure gauges based on a change in water pressure of each of the plurality of parts measured by a plurality of pressure gauges attached to a plurality of points in the water distribution pipe network. A difference estimator;
Based on the distance difference estimated by the distance difference estimator, a position estimator that estimates a water leak location in the water distribution network,
A water leakage monitoring device comprising: On the computer,
Based on the change in the water pressure of each of the plurality of locations measured by a plurality of pressure gauges attached to a plurality of locations in the water distribution pipe network, the distance difference from the water leakage location to each pressure gauge is estimated,
Based on the estimated distance difference, the water leakage point in the water distribution network is estimated,
Water leakage monitoring program.

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