JP5244569B2 - Water volume measurement system - Google Patents

Description

  The present invention relates to a measurement system for the amount of water flowing in a sewer pipe.

  For the measurement of the water level or flow rate of sewage flowing in the sewer pipe, a radio wave or ultrasonic water level meter that is installed above the surface of the water and performs measurement, an ultrasonic flow meter that can be installed under the water surface, Pressure sensor type water level gauge, capacitance type water level gauge, etc. are used.

  Radio wave level gauges and ultrasonic water level gauges are limited in that they cannot be installed in sewer pipes that are full and may be submerged. Ultrasonic flow meters and pressure sensor types that can be installed in water Alternatively, the capacitance type water level meter requires a cable for power supply to the sensor and data communication, and installation work becomes large. In addition, there is a problem that it is not easy to remove and maintain.

On the other hand, wireless tag (RFID) systems capable of non-contact information communication are widespread, and Patent Document 1 simply measures the liquid water level using an RFID tag that does not require a cable. A measurement system is described.
JP 2005-331347 A

  However, the conventional measurement system using RFID mainly aims at the level of still water, and when installed in a permanent facility such as a sewer pipe, it is not a measurement system that can withstand long-term use. There was a problem.

  In view of the above problems, an object of the present invention is to provide a water amount measurement system that can be installed in a sewer pipe by a simple method and can withstand long-term use.

In order to solve the above problems, a water amount measurement system according to the present invention is a measurement system for the amount of water flowing in a sewer pipe, and includes a plurality of wireless tags arranged on the inner surface of the sewer pipe, and a water surface in the sewer pipe. A reader device that performs wireless communication with the wireless tag positioned above, and the wireless tag includes an antenna having a solid angle with respect to a propagation direction of a radio wave emitted by the reader device. The sewer pipe has an elliptical cross section intersecting the water flow direction, and the plurality of wireless tags are arranged along the cross section. .

According to the present invention, since the length of the peripheral surface on which the wireless tag is disposed is increased, more wireless tags can be disposed, so that the water level detection accuracy can be increased. Further, the wireless tag can be arranged so as to surround the reader device, and the solid angle of each antenna can be prevented from becoming zero.

  The wireless tag used in the present invention is an IC chip with an antenna that can communicate with a reader device. For example, an RFID tag enclosed in a commercially available resin package or an RFID tag laminated between resin sheets can be used. Of the wireless tags placed on the inner peripheral surface of the sewer pipe, those located below the water surface cannot communicate with the reader device, and only the wireless tag located above the water surface communicates with the reader device for identification information. send. Thereby, a wireless tag functions as a sensor which detects the presence or absence of water. The amount of water is the level of water flowing through the sewer pipe or the flow rate per unit time calculated from the water level.

  Moreover, the water amount measurement system according to the present invention includes a protective layer attached to the inner surface of the sewer pipe and covering the wireless tag. Thereby, since the wireless tag is covered with the protective layer, it is not exposed to corrosive sewage flowing through the sewer pipe, and there is no possibility of causing functional deterioration. Moreover, there is no fear of being washed away. Therefore, it can be set as the water quantity measurement system which can be used for a long period of time.

  In the water amount measurement system according to the present invention, the protective layer is a pipe rehabilitation material installed on the inner surface of the sewer pipe. That is, the water amount measurement system according to the present invention can be installed not only at the time of first laying a sewer pipe, but also at an existing sewer pipe. For example, it can be installed in the rehabilitation work of aged sewer pipes.

  Furthermore, the water amount measurement system according to the present invention includes a data processing device that calculates the water level or flow rate of water flowing through the sewer pipe based on the identification information of the wireless tag read by the reader device, and the water level or And an output device that outputs a flow rate. As will be described later, the flow rate of water flowing through the sewer pipe can be calculated from the water level detected based on the identification information of the wireless tag. Thereby, the water level or flow rate in the sewer pipe can be transmitted in real time, and the data processing load in the host system can be reduced.

  The data processing device can use, for example, a microcomputer, and the output device can transfer data to a host system, such as a transmission / reception device for microwave communication or an optical line termination device (OUN) for optical fiber communication. Is preferred.

  In the water amount measurement system according to the present invention, the output device outputs an alarm signal when the calculated water level or flow rate exceeds a predetermined amount. This makes it possible to take safety measures against the increase in sewerage in the host system.

Further, in the water amount measurement system according to the present invention, the cross section has an upper portion in the height direction, a lower portion below the upper portion, and a central portion sandwiched between the upper portion and the lower portion, The lower portion and the central portion each have a plurality of the wireless tags, and a distance between the plurality of wireless tags in the central portion is shorter than a distance between the plurality of wireless tags in the lower portion. And Thereby, the detection accuracy of a water level can be made high in the center part of a sewer pipe.

  In the water amount measurement system according to the present invention, the wireless tag is arranged at a position for detecting a water level corresponding to a multiple of the reference water amount flowing through the sewer pipe. For example, if the maximum amount of water in the steady state is set to 1Q and the water level corresponding to the flow rate such as 2Q, 3Q, etc., is arranged at a position where the water level can be detected, data suitable for a predetermined management system can be directly output.

The water amount measurement system according to the present invention further includes a data processing device that processes information obtained from the wireless tag, and the plurality of wireless tags constitutes a plurality of wireless tag groups arranged in a predetermined arrangement. The plurality of wireless tag groups include a first wireless tag having first identification information and a plurality of second wireless tags including second identification information different from the first identification information, respectively. And in the plurality of wireless tag groups, the first wireless tag and the second wireless tag are arranged in a predetermined arrangement so that the plurality of first wireless tags are arranged on the inner surface of the sewer pipe. The tag and the plurality of second wireless tags are arranged with periodicity, and the data processing device processes information based on the periodicity . As will be described later, according to the present invention, the length of the inner peripheral surface of the sewer pipe not in contact with water is detected based on the periodicity imparted to the wireless tag, and the flow rate and the water level are obtained. Therefore, in calculating the flow rate and the water level, it is not necessary to identify the individual wireless tags and capture the arrangement positions. As a result, it is possible to increase the degree of freedom in arranging the wireless tags.

  ADVANTAGE OF THE INVENTION According to this invention, it can install in a sewer pipe by a simple method and can implement | achieve the water quantity measuring system which can be used for a long period of time.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

  Drawing 1 is a mimetic diagram showing the section of a sewer pipe provided with the water quantity measuring system concerning this embodiment. A wireless tag 4 is disposed on the inner surface of the sewer pipe 1. As for the wireless tag 4, five pieces of 4a-4e are arrange | positioned at the up-down direction of the inner surface. In addition, a reader device 5 that performs wireless communication with each wireless tag 4 and an output device 7 that outputs information read by the reader device 5 are provided. Furthermore, a data processing device 6 for calculating the water level and flow rate of the water flowing inside the sewer pipe 1 based on the identification information of the wireless tag 4 read by the reader device 5 is provided. It is connected.

  The installation location of the water amount measurement system is preferably in the vicinity of the manhole 3 where workers can enter and exit so that maintenance after installation is easy. In addition, the reader device 5 must be installed at a position where wireless communication is possible with the wireless tag 4 so that the reader device 5 does not submerge when the water increases. Therefore, as shown in FIG. 1, the position where the wall surface 3a of the manhole 3 and the sewage pipe 1 are connected is suitable.

  FIG. 2 is a schematic diagram showing a transverse section of the sewer pipe 1 in the flowing direction. The wireless tags 4 a to 4 e are arranged along the inner peripheral surface of the sewer pipe 1. In the example in the figure, the wireless tags 4d and 4e are submerged in water and cannot perform wireless communication with the reader device 5. On the other hand, since the wireless tags 4a, 4b, and 4c are located above the water surface 2, they can communicate with the reader device 5.

  Therefore, the reader device 5 shown in FIG. 1 can receive the communication signals from the wireless tags 4 a, 4 b, 4 c, read each identification information, and output it to the data processing device 6. The data processing device 6 recognizes the identification information of the wireless tags 4a, 4b, and 4c. On the other hand, since the identification information of the wireless tags 4d and 4e is not input, the water surface 2 is between the wireless tags 4c and 4d. Recognize that. Further, the position of the water surface 2 between the wireless tags 4 c and 4 d is transmitted to the upper system via the output device 7 as the water level of the sewer pipe 1.

  In addition, the reader device 5 reads the identification information of the wireless tag 4 at a predetermined time interval, and the data processing device 6 calculates the average water level based on the received identification information and transmits it from the output device 7 to the host system. It is also good.

ここで、潤辺Ｓは、流れ方向の横断面において水に接している管壁の長さである。また、Ｒは水理学的平均水深、Ｉは水面勾配である。ｎはマニングの粗度係数であり、下水管の内周面の材質に固有の係数である。例えば、コンクリート面では０．０１４、樹脂コートされた面においては０．００９が用いられている。 Further, based on the position of the water surface 2 recognized from the identification information of the wireless tag 4 read by the reader device 5, the wetted water S and the water flow cross-sectional area A (see FIG. 2) of the sewer pipe 1 are calculated. The average flow velocity V of water can be calculated using the Manning equation shown.

Here, the wetting edge S is the length of the tube wall in contact with water in the cross section in the flow direction. R is the hydraulic average depth, and I is the water surface gradient. n is a roughness coefficient of Manning and is a coefficient specific to the material of the inner peripheral surface of the sewer pipe. For example, 0.014 is used on the concrete surface and 0.009 is used on the resin-coated surface.

  In the data processing device 6 shown in FIG. 1, the average flow velocity V is obtained according to the Manning equation, the flow rate per unit time is calculated, and transmitted to the host system via the output device 7. Accordingly, it is possible to construct a sewerage management system that acquires flow rate data transmitted from a plurality of flow rate measurement systems, performs an outflow analysis of a sewer pipe network in real time, and predicts a downstream flow rate.

  In the above embodiment, the data processing device 6 is omitted, and the identification information of the wireless tags 4a, 4b, and 4c read by the reader device 5 is directly transmitted to the host system via the output device 7, and the host system transmits data. A configuration for executing processing is also possible. On the other hand, in a large-scale sewer system composed of sewer pipes having various shapes and sizes, the above-described water amount measurement system that includes the data processing device 6 and can reduce the data processing burden of the host system is suitable. It is.

  FIG. 3 shows functional blocks of the water amount measurement system according to this embodiment. As described above, this system includes the wireless tag 4, the reader device 5, the data processing device 6, and the output device 7.

  The wireless tag 4 includes an IC including a control circuit 22 and a memory 23, and an antenna 21. An electromotive force is generated in the antenna 21 by the electromagnetic field of the radio wave transmitted from the reader device 5, and the control circuit 22 and the memory 23 are driven. At this time, if the receiving surface of the antenna 21 is not arranged so as to have a predetermined solid angle with respect to the propagation direction of the radio wave transmitted from the reader device 5, no electromotive force is generated. do not do. Therefore, the wireless tag 4 needs to be arranged so that the solid angle of the receiving surface of the antenna 21 is not at least zero with respect to the propagation direction of the radio wave transmitted from the reader device 5.

  The memory 23 stores identification information for identifying the wireless tag 4 from other wireless tags, and the control circuit 22 driven by the electromotive force generated by the antenna 21 reads the identification information from the memory 23 and identifies the identification information. Is transmitted from the antenna 21.

  The reader device 5 includes an antenna 24 and a control circuit 25. The control circuit 25 transmits a radio wave for driving the wireless tag 4 from the antenna 24, while receiving the radio wave transmitted from the wireless tag 4 by the antenna 24, and extracts identification information from the received signal. Further, the extracted identification information is converted into a code capable of data processing and sent to the data processing device 6.

The data processing device 6 is a microcomputer including a CPU 27, a memory 29, and an interface circuit 28. The data processing device 6 receives the identification information of the wireless tag 4 from the reader device 5 through the interface circuit 28, and can communicate with the reader device 5 in the wireless tag 4 arranged on the inner peripheral surface of the sewer pipe 1. The wireless tag 4 located above the water surface 2 is recognized. On the other hand, the arrangement of the wireless tag 4 is stored in the memory 29, and the water level in the sewer pipe is determined based on the recognized arrangement of the wireless tag 4 above the water surface 2. Furthermore, the data processing device 6 calculates the flow rate of the water flowing through the sewer pipe 1 using the aforementioned Manning equation based on the determined water level. Parameters such as the inner diameter R ₀ of the sewer 1, the water surface gradient I, and the Manning roughness coefficient n are stored in the memory 29.

  The data processing device 6 also functions as a controller that controls the reader device 5 and the output device 7. A program for controlling these devices is stored in the memory 29. For example, the data processing device 6 sends the determined water level and flow rate data to the output device 7, controls the communication controller 30, and sends it to the host system. The output device 7 includes a communication controller 30 and a microwave transmission / reception unit 31. The transmission / reception unit 31 is controlled by the communication controller 30, and performs data communication with a host system via a base station of a mobile phone. Do.

  In the system configuration described above, the output device 7 may be configured as an optical line terminating device (OUN) for optical fiber communication and connected to a host system via an optical fiber communication network. Further, as described above, the system does not include the data processing device 6, and the communication controller 30 of the output device 7 controls the reader device 5, and the identification information read by the reader device 5 is transferred from the output device 7 to the host system. It is also possible to adopt a configuration for transmission.

  In addition, in order to prevent flooding due to sudden increase of water, etc., the warning water level or the warning flow rate is set in advance, and when the water level or the flow rate calculated by the data processing device 6 exceeds the warning water level or the warning flow rate, It can be set as the structure which outputs an alarm signal from the output device 7 to a high-order system. As a result, it is possible to construct a host system equipped with safety measures against floods and the like.

  FIG. 4 is a schematic view showing a first arrangement method of the wireless tag in the flow measurement system according to the present invention. The wireless tags 4a to 4e are arranged on the inner peripheral surface of the sewer pipe 1, and the respective arrangement positions correspond to the water levels set at equal intervals of the width W. Thereby, the water level of the water flowing through the sewer pipe 1 can be detected in units of W. For example, when the reader device 5 communicates with all of the wireless tags 4a to 4e and acquires the identification information, the data processing device 6 determines that the water level is at the position of 1 W, and communicates with 4a to 4d. If the identification information is acquired, the water level is determined to be 2W.

  The wireless tags 4 a to 4 e are disposed between the sewer pipe 1 and the resin protective layer 12 attached to the inner surface of the sewer pipe 1. Thereby, since the wireless tags 4a to 4e are not exposed to the water flowing inside the sewage pipe 1, it is possible to prevent functional deterioration and loss due to corrosive sewage. Needless to say, the wireless tag 4 and the protective layer 12 are provided at the time of installation of the sewer pipe. However, in the rehabilitation work of the aging sewer pipe, the radio tag is arranged on the inner surface of the sewer pipe, and the protective layer 12 is used as the protective layer 12. It is also possible to install a water measurement system by covering it with rehabilitation material. The protective layer 12 is made of a material that does not hinder communication between the wireless tag 4 and the reader device 5. For example, a material including a fine mesh-shaped reinforcing material made of metal absorbs radio waves and cannot be used.

  FIG. 5 is a perspective view schematically showing the arrangement of the wireless tag 4. FIG. 5A shows a virtual cross section orthogonal to the water flow direction of the water flowing through the sewer pipe 1, and the wireless tag 4 is arranged along a circular cross section. On the other hand, FIG.5 (b) has shown the virtual cross section which has the predetermined inclination with respect to the water flow direction, and the wireless tag 4 is arrange | positioned along the elliptical cross section. In this case, since the length of the circumferential surface to be arranged is longer than that in FIG. 5A, more radio tags 4 are arranged even if the arrangement intervals of the radio tags 4 are set to the same width. be able to. That is, the water level can be detected with a narrower width W than in the case where the water level is arranged along the circular cross section shown in FIG.

  In addition, as described above, when the wireless tag 4 is arranged along a cross section intersecting with the water flow direction of the sewer pipe, a method of attaching a resin plate or a resin sheet to which the wireless tag is attached in advance to the inner peripheral surface of the sewer pipe is provided. It becomes possible to install a wireless tag. As a result, the installation work is facilitated, and there is a certain regularity in the arrangement of the wireless tags, so that it is possible to easily determine whether or not there is a displacement of the arrangement position.

  FIG. 6A is a schematic diagram showing a second arrangement method in which the resin plate 13 in which the wireless tags 4 a to 4 e are arranged at predetermined positions is arranged between the sewer pipe 1 and the protective layer 12. FIG. 6B is a schematic diagram showing the wireless tags 4a to 4e arranged on the resin plate. The arrangement positions of the wireless tags 4a to 4e are set according to the water level of the sewer pipe 1 suitable for the detection purpose. For example, when monitoring a change in the amount of water flowing through a sewer pipe, it is conceivable that a relatively large number are arranged at positions where the water level at the center of the sewer pipe is detected. In addition, when the purpose is to monitor the increase of water and issue an alarm, it is conceivable to set a warning water level and place it at a position where the water level is detected.

  As the resin plate 13, one obtained by sandwiching the wireless tag 4 between two plates formed of synthetic resin, or one obtained by attaching the wireless tags 4 a to 4 e to the surface of the resin plate can be used. Alternatively, the wireless tags 4a to 4e may be laminated between resin sheets. It is clear that the installation work can be simplified by using the resin plate 13 as compared with the method of arranging the individual wireless tags 4a to 4e.

ここで、Ｒ_０は、下水管１の内径である。上式により算出されるＸに従って、Ｎｏ．２からＮｏ．１１までの無線タグを配置した場合、図７（ａ）に示すように、樹脂プレート１３の中心部において相対的に数多く配置され、周辺部において数が少なくなる。 FIG. 7A is a schematic diagram showing the arrangement positions of the wireless tags arranged on the resin plate 13 when the water level of the sewer pipe 1 is detected at intervals of 10% from 0 to 100%. . No. corresponding to 0% water level. With reference to the position of one wireless tag, the length X to the arrangement position of the Nth wireless tag is expressed by the following equation.

Here, R ₀ is the inner diameter of the sewer pipe 1. According to X calculated by the above equation, No. 2 to No. When up to 11 wireless tags are arranged, as shown in FIG. 7A, a relatively large number are arranged in the central portion of the resin plate 13, and the number is reduced in the peripheral portion.

  On the other hand, FIG. 7B shows the relationship between the number of the wireless tag and the water level to which each wireless tag corresponds when the resin plate 13 shown in FIG. 7A is installed in the circular sewage pipe 1. It is a graph. As shown in the figure, when installed in the sewage pipe 1, each wireless tag is arranged to indicate a water level at equal intervals of 10%.

  On the other hand, FIG. 8 shows the relationship between each wireless tag and the water level when arranged on the resin plate at equal intervals. FIG. 8A shows a wireless tag No. 1-No. 11 shows an arrangement on the 11 resin plates 13. No. corresponding to 0% water level. 1 wireless tag and No. 1 corresponding to 100%. The position of the wireless tag 11 is the same as the position of the wireless tag of the same number shown in FIG.

  FIG. 8B is a graph showing the relationship between the wireless tag number and the water level corresponding to each wireless tag when the resin plate 13 shown in FIG. 8A is installed in the circular sewage pipe 1. . In this case, the water level corresponding to each wireless tag is not equally spaced, and the No. corresponding to the central portion of the sewer pipe. 4-No. In the 8 tag, the interval between the water levels is wide, and in the upper and lower tags, it is narrow. Thereby, the detection accuracy of the water level in the central portion becomes rough, and the accuracy becomes high in the upper and lower portions. On the other hand, in the circular sewer pipe as shown in the figure, the fluctuation of the water level corresponding to the change in the flow rate is smaller in the central part than in the upper and lower parts. Therefore, it is desirable that the detection accuracy is high in the central portion, and it is clear that the arrangement of FIG. 7 that can obtain the detection accuracy equally in the entire range is more preferable.

  Furthermore, in the resin plate 13 shown in FIG. 7 (a), it is possible to increase the accuracy so that the water level at the center is detected with a width of 10% or less by additionally arranging the wireless tag 4 at the center. It is.

  FIG. 9 is a schematic diagram showing a third arrangement method of the wireless tag according to the flow measurement system of the present invention. In the present embodiment, each of the wireless tags 8a to 8f is arranged at a position for detecting a water level corresponding to a multiple of the reference water amount flowing through the sewer pipe. Further, in this embodiment, the wireless tags 9a to 9f are arranged on the surface facing the inner peripheral surface on which the wireless tags 8a to 8f are installed to improve the detection accuracy of the water level. By using a plurality of wireless tags that detect the same water level, it is possible to correct erroneous detection of recognition information. Further, since the water surface 2 in the sewer pipe 1 is a moving water surface that fluctuates vertically and horizontally, the wireless tags 8a to 8f and 9a to 9f are arranged on both sides of the inner peripheral surface, and detection is performed by taking a time average of detection data. The accuracy can be improved.

  Further, as shown in the figure, if 1Q is a reference water amount, and the wireless tags 8a to 8f and 9a to 9f are arranged at positions where the water levels corresponding to the flow rates of 2Q, 3Q, and multiples thereof can be detected, predetermined management is performed. Data suitable for the system can be output directly. For example, the present invention can be applied to a combined sewer system or the like that treats the planned inflow sewage amount 1Qsh at the time of fine weather as the reference water amount and the water amount increased at the time of rain as 2Qsh, 3Qsh.

  FIG. 10 is a schematic diagram showing a fourth arrangement method of the wireless tag according to the flow measurement system of the present invention. In this embodiment, a resin tape 17 in which a plurality of wireless tags 4 shown in FIG. The wireless tags 4 are arranged with a constant interval L, and identification codes a to e are assigned to the wireless tags so as to have a period T, respectively, and are stored in the memory 23 (see FIG. 3). It is remembered. The resin tape 17 is a long tape wound around a roll 18, and is used by being cut according to the length of the inner peripheral surface of the sewer pipe 1.

  FIG. 10B is a schematic view showing a cross section of the sewer pipe 1 with the resin tape 17 attached to the inner peripheral surface. The resin tape 17 is disposed between the sewer pipe 1 and the protective layer 12, and the end of the resin tape 17 is always disposed in the lower portion of the sewer pipe 1 that is below the water surface. In the present embodiment, the relationship between the position of the wireless tag 4 and the water level in the sewage pipe 1 is arbitrary, and it is not necessary to match the arrangement position of the resin tape 17 to a predetermined water level, so installation work is facilitated. In the present embodiment, the water level and flow rate of the sewer pipe 1 are calculated by the method described below.

  First, the identification information stored in the memory 23 of each wireless tag is read and sent to the data processing device 6 by communication between the reader device 5 and the wireless tag 4 (see FIG. 3). The data processing device 6 recognizes the identification codes a to e from the identification information received from the reader device 5 and calculates the flow rate and the water level based on the period T. Further, the data processing device 6 sends the calculated flow rate and water level to the output device 7 for output to the host system.

  As shown in FIG. 10B, the wireless tag 4 for four periods, the tag (identification code e) deviating from the period located on the left side in the figure, and the two tags deviating from the period located on the right side When (identification codes a and b) are located above the water surface 2, the number of identification codes recognized from the identification information read by the reader device 5 is the number in the table shown in FIG. .

Based on the number of identification codes read by the reader device 5, the data processing device 6 confirms that the wireless tags 4 for four periods and the three wireless tags 4 out of the period are located above the water surface 2. recognize. Furthermore, the data processing device 6, based on the cross-sectional shape of the sewer pipe, using a number n _A deviated from the cycle number n _T and the period of the wireless tag 4, to calculate the wetted perimeter S and water flow cross-sectional area A, above The flow rate is calculated using the Manning equation. Also, the water level D is calculated.

ここで、Ｒ_０は、下水管１の内径である。また、Ｔは周期、Ｌは無線タグ４の配置間隔である。 When the sewage pipe 1 is circular, the wetted edge S, the water flow cross-sectional area A, and the water level D can be calculated using the following equations.

Here, R ₀ is the inner diameter of the sewer pipe 1. T is a period, and L is an arrangement interval of the wireless tags 4.

  In the wireless communication between the reader device 5 and the wireless tag 4, the wireless tag 4 that has received the radio wave transmitted from the reader device 5 obtains the electromotive force, transmits the identification information, and receives the radio wave from the wireless tag 4. This is implemented by the reader device 5 reading the identification information. Therefore, as described above, the antenna 24 of the reader device 5 and the antenna 21 of the wireless tag 4 need to be arranged so that the solid angle is not zero. 11 to 13 are schematic views showing a method of arranging the wireless tag 4 in which the solid angle between the antennas is not zero.

  In the fifth arrangement method shown in FIG. 11, the wireless tag 4 is arranged along a virtual section AA inclined with respect to the flowing water direction. The wireless tag 4 is placed in an elliptical shape (see FIG. 5B), while the reader device 5 is placed above the center of the ellipse. As a result, the wireless tag 4 is arranged so as to surround the reader device 5, and the solid angles of the antennas 21 and 24 can be prevented from becoming zero.

  In the sixth arrangement method shown in FIG. 12, only the height position of each wireless tag 4 corresponding to the water level to be detected is set, and the horizontal installation position is a solid angle with the antenna 24 of the reader device 5. Decide based on the size of. That is, the wireless tag 4 placed at the water level where the solid angle becomes relatively small is placed near the reader device 5 so that the electromotive force induced by the radio wave of the reader device 5 is increased.

  FIG. 13 shows an example in which the wireless tag 4 is attached to the resin plate 13 described above (see FIG. 6). In each wireless tag 4, when the solid angle with the antenna 24 of the reader device 5 is zero, or when the electromotive force necessary for driving is not obtained, the tapered raised portion 13a is provided on the installation surface. Provide a larger solid angle. The resin plate 13 used in this embodiment is manufactured by integrally molding the plate portion and the raised portion 13a. At this time, the taper angle of the raised portion 13a is calculated based on the inclination of the resin plate 13 with respect to the flowing water direction and the arrangement position of the wireless tag.

  The arrangement method of the wireless tag 4 that does not make the solid angle with the reader device 5 zero is not limited to the above embodiment, and the directivity depends on the structure of the antenna 24 of the reader device and the antenna 21 of the wireless tag 21. In consideration of the nature, it is determined based on the environment in which the water measurement system is installed.

  Although the preferred embodiments of the present invention have been described in detail above, the water amount measuring system according to the present invention is not limited to the above-described embodiments, and is within the scope of the gist of the present invention described in the claims. Various modifications and changes are possible.

It is a schematic diagram which shows the cross section of the sewer pipe provided with the water quantity measuring system which concerns on this invention. It is a schematic diagram which shows the cross section of the flowing direction of the sewer pipe provided with the water quantity measuring system which concerns on this invention. It is a functional block of the water quantity measuring system concerning the present invention. It is a schematic diagram which shows the 1st arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 1st arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 2nd arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 2nd arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 2nd arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 3rd arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 4th arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 5th arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 6th arrangement | positioning method of the wireless tag which concerns on this invention. It is a schematic diagram which shows the 7th arrangement | positioning method of the wireless tag which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewer pipe 2 Water surface 4 Wireless tag 5 Reader apparatus 6 Data processing apparatus 7 Output apparatus 8, 9 Wireless tag 12 Protective layer

Claims (8)

A system for measuring the amount of water flowing through a sewer pipe,
A plurality of wireless tags arranged on the inner surface of the sewer pipe;
A reader device that performs wireless communication with the wireless tag located above the water surface in the sewer pipe,
The wireless tag is a system for measuring the amount of water flowing through a sewer pipe provided with an antenna having a solid angle with respect to the propagation direction of radio waves emitted by the reader device ,
The sewer pipe has an elliptical cross section intersecting the water flow direction,
The water quantity measuring system, wherein the plurality of wireless tags are arranged along the cross section . The water amount measuring system according to claim 1, further comprising a protective layer attached to an inner surface of the sewer pipe and covering the wireless tag. The protective layer is
The water amount measuring system according to claim 2, wherein the water amount measuring system is a pipe rehabilitation material installed on the inner surface of the sewer pipe. Based on the identification information of the wireless tag read by the reader device, a data processing device that calculates the water level or flow rate of water flowing through the sewer pipe,
An output device for outputting the water level or flow rate calculated by the data processing device;
The water amount measuring system according to claim 1, comprising: The output device is
The water amount measuring system according to claim 4, wherein an alarm signal is output when the calculated water level or flow rate exceeds a predetermined amount. The cross section has an upper part in the height direction, a lower part below the upper part, and a central part sandwiched between the upper part and the lower part,
Each of the upper part, the lower part, and the central part has a plurality of the wireless tags,
The water amount measurement system according to any one of claims 1 to 5 , wherein a distance between the plurality of wireless tags in the central portion is shorter than a distance between the plurality of wireless tags in the lower part . The wireless tag is
The water amount measuring system according to any one of claims 1 to 5 , wherein the water amount measuring system is disposed at a position for detecting a water level corresponding to a multiple of a reference water amount flowing through the sewer pipe. A data processing device for processing information obtained from the wireless tag;
The plurality of wireless tags constitute a plurality of wireless tag groups arranged in a predetermined arrangement,
Each of the plurality of wireless tag groups includes a first wireless tag having first identification information and a plurality of second wireless tags including second identification information different from the first identification information. ,
In the plurality of wireless tag groups, the first wireless tag and the second wireless tag are arranged in a predetermined arrangement so that the plurality of first wireless tags and the plurality of wireless tags are arranged on the inner surface of the sewer pipe. And the second wireless tag are arranged with periodicity,
The data processing apparatus, water measurement system according to any one of claims 1 to 5, characterized in that for processing information based on the periodicity.

Images