JP4654206B2 - Sewerage unknown water detection method and device - Google Patents

Description

  The present invention relates to a method and an apparatus for detecting unknown water in a sewage system that estimates a flow rate from information on a flow velocity and a water level in a sewage pipe line in order to detect unknown water flowing into the sewage pipe line.

  In sewerage pipe facilities, rainwater and groundwater other than sewage may flow in, and this inflow is called unknown water. Since the cost of processing unknown water cannot be recovered, the processing cost of sewage increases. In addition, the amount of unknown water increased, and there was a risk of poor processing and insufficient processing capacity.

  A method for detecting unknown water has been proposed so far, but in order to detect it, it is necessary to measure the flow rate of sewage and grasp the balance of sewage. As a means for measuring the flow rate in the sewer pipe, for example, there is one described in [Patent Document 1].

  Moreover, as an example of installing a wireless IC tag in a sewer pipe, there is one described in [Patent Document 2], for example.

JP-A-8-193858 JP 2006-105820 A

  As an example of means for measuring the flow rate in the sewer pipe, there is an electromagnetic flow meter as described in [Patent Document 1], but the flow meter is added to a part of the pipeline for flow measurement. The construction of the pipe line for installing the flow meter is necessary, and the pipe line cannot be easily attached and detached, which may increase the installation cost. In addition, an electric work for supplying power to the detection unit is required, which may increase the installation cost. Moreover, since a flow meter is always exposed to sewage, a detection part may deteriorate.

Although the wireless IC tag can reduce the installation cost, there is a problem that the method of using the wireless IC tag as described in [Patent Document 2] cannot measure the flow rate, flow velocity, water level, and the like in the pipeline.

  An object of the present invention is to provide a method and an apparatus for detecting unknown water in a sewer system that uses a wireless IC tag to measure a flow velocity or a water level, and that is low in cost and has little deterioration in detection means.

  In order to achieve the above object, the present invention provides a plurality of wireless IC tags installed on an inner wall of a sewer pipe, an IC tag database for storing data of installation positions and installation intervals of the wireless IC tags, A wireless IC tag reader that flows down in a sewer pipe, and a storage unit that can record a time of communication with the wireless IC tag in the wireless IC tag reader or an elapsed time from communication with the first wireless IC tag. Equipped to detect the flow rate.

  In addition, a plurality of wireless IC tags having different communication distances in the same communication frequency band installed within a radius of 50 cm of the inner wall of the sewer pipe, and the wireless IC tag to the wireless IC tag reader flowing down in the sewer pipe The storage part which preserve | saves the following communication information is provided, and a water level is detected.

  In addition, a wireless IC tag is installed on the inner wall of the sewer pipe, and the wireless IC tag reader that naturally flows down the sewer pipe is provided with at least two antennas having different communication distances to detect the water level. .

  In addition, a wireless IC tag with a plurality of waterproof treatments installed around the inner wall of the sewer pipe, a wireless IC tag reader that flows down in the sewer pipe, and installation position data of the wireless IC tag. It has a saved database and detects the water level.

  In any one of the above-described wireless IC tag readers, waterproofing is performed, and when the antenna for communication with the wireless IC tag is installed on the upper surface and floated on water, the antenna is above the water surface. The buoyancy is adjusted as follows.

  In any one of the above wireless IC tag readers, when communicating with the wireless IC tag, at least one of the function of collecting sewage or the pH, turbidity, chromaticity, water temperature, and organic matter concentration of sewage It is to be measured.

  The wireless IC tag reader includes a distance measuring unit for measuring a distance, and when the wireless IC tag reader communicates with the wireless IC tag, the distance measuring unit The distance between the inner wall of the sewer pipe and the wireless IC tag reader is measured.

  A plurality of wireless IC tag writers installed on the inner wall of the sewer pipe, an IC tag writer database for storing data of installation positions and installation intervals of the wireless IC tag writers, and radio that floats and flows down in the sewer pipe And a storage unit capable of recording a communication time with the wireless IC tag writer on the wireless IC tag, and detecting a flow velocity.

  A plurality of wireless IC tag readers installed on the inner wall of a sewer pipe, an IC tag reader database for storing data of installation positions and installation intervals of the wireless IC tag readers, and a wireless system that floats and flows down in the sewer pipes An IC tag and a storage unit capable of recording a communication time with the wireless IC tag in the wireless IC tag reader are provided to detect a flow velocity. Further, communication means for communicating communication information of the wireless IC tag reader is provided.

  In the above-described at least one unknown water detection system, a rainfall amount database in a sewer basin is provided so that the relationship between the rainfall amount and the flow velocity or water level can be grasped.

  According to the present invention, by flowing down a wireless IC tag or a wireless IC tag reader, the flow velocity or water level can be measured, and the presence or absence of unknown water can be determined.

  Embodiments 1 to 8 of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an unknown water detection system in the present embodiment. Sewage flows in a sewer pipe 1 made of a PVC pipe or a fume pipe buried in the ground. Generally, when the flow rate in the sewer pipe 1 increases, the flow velocity increases. For this reason, when unknown water flows in and the flow rate increases, the flow velocity increases.

  A wireless IC tag 2 is installed on the inner wall of the sewer pipe 1. The wireless IC tag 2 includes a circuit unit including at least an IC chip and an antenna unit. The surface of the wireless IC tag 2 is waterproofed so that it does not easily deteriorate in the sewer pipe 1. A plurality of wireless IC tags 2 are installed at a distance from the upper part of the inner wall of the sewer pipe 1. The wireless IC tag 2 can be installed in the sewer pipe 1 by entering the sewer pipe 1 from a manhole (not shown) into the sewer pipe 1.

  The wireless IC tag reader 3 includes at least an antenna for communicating with the wireless IC tag 2, a circuit unit including a CPU and a memory, and a power supply unit. The wireless IC tag reader 3 is waterproofed and floats in sewage. An antenna unit is installed above the water line so that it can communicate with the wireless IC tag 2.

  In order to adjust the buoyancy, a buoyancy adjustment unit (not shown) made of plastic or the like is provided. In addition, by arranging a heavy power supply unit at the lower part, the antenna unit can be easily returned to the upper part even when it is rolled over. The wireless IC tag reader 3 flows down according to the flow of sewage, and as it flows down, it sequentially communicates from the wireless IC tag 2-1 on the upstream side to the wireless IC tag 2-2 on the downstream side and the wireless IC tag 2-3. To do.

The wireless IC tag reader 3 communicates with the wireless IC tag 2 so that information for specifying a tag written in the wireless IC tag 2 in advance and the time of communication or the wireless IC tag 2-2. The elapsed time since communication with the wireless IC tag 2-1 when passing through 2-3 is stored in the wireless IC tag reader 3. The accumulated data is stored in a non-volatile memory that can be stored even after the power of the power supply unit is consumed.

  Although not shown, the wireless IC tag reader 3 is collected at a pump station or a sewage treatment plant provided downstream of the sewer pipe 1. Further, the sewer pipe 1 may be recovered by providing a recovery mechanism. In the wireless IC tag reader 3, data accumulated after collection is taken into data analysis means (not shown) configured by a computer or the like.

  The data analysis means is from an IC tag database (not shown) for storing data such as the installation positions and intervals of the wireless IC tags 2-1 to 2-3, and the installed sewer pipes 1 and the like. Information is available.

Below, the unknown water detection method by a data analysis means is demonstrated. The data analysis means identifies the wireless IC tag from the data stored in the wireless IC tag reader 3, and obtains the time when the wireless IC tag passed.

  As an example, the passage time of the wireless IC tag 2-1 is 9:10, the passage time of the wireless IC tag 2-2 is 9:20, and the passage time of the wireless IC tag 2-3 is 9:40. And

  The data analyzing means obtains data on the installation distance between the wireless IC tag 2-1 and the wireless IC tag 2-2 and the wireless IC tag 2-2 and the wireless IC tag 2-3 from the IC tag database. . As an example, the former is 100 m and the latter is 300 m.

  Based on these pieces of information, the data analyzing means sets the flow rate between the wireless IC tag 2-1 and the wireless IC tag 2-2 to 10 m / min, the wireless IC tag 2-2 and the wireless IC tag 2- The flow rate between 3 is calculated as 15 m / min. Although the passage time is used for the calculation of the current flow velocity, data of the elapsed time from the passage of the wireless IC tag 2-1 may be used.

  Next, the data analysis means determines the presence or absence of unknown water. The data analysis means accumulates the measurement result of the flow velocity, and determines that there is an inflow of unknown water in the section when the flow velocity increases about 1.5 times the average value. Since the wireless IC tag 2 is fixed and there is no change in distance, the time that is the difference in time passing through the wireless IC tag 2 is proportional to the flow velocity. For this reason, when this transit time data is accumulated and the time is shortened to about 2/3, it may be determined that there is an inflow of unknown water.

  Further, the data analysis means inputs rainfall data from the rainfall database in the basin of the sewer pipe 1 and determines the presence or absence of unknown water from the relationship between the rainfall data and the flow velocity.

  An example of the determination method will be described below. When rain data is input, the data analysis means plots the relationship between the rainfall and the flow velocity as shown in FIG. As shown in FIG. 8, when the flow rate tends to increase with respect to the amount of rainfall, for example, linear approximation is performed, and the slope of the approximated straight line is compared with the reference value. A reference value of 2 is appropriate. When the reference value exceeds the reference value, it is determined that there is an inflow of unknown water in that section.

  As a result of adding a new pipeline to the sewer pipeline 1, if the flow velocity increases, it is not determined that the water is unknown.

  The wireless IC tag 2 can return data by receiving a radio wave or a magnetic field output from the antenna of the wireless IC tag reader 3 and performing an alternating current. This eliminates the need for a power supply and eliminates the need for power supply construction during installation, thereby reducing construction costs.

  According to the present embodiment, by installing a wireless IC tag that is inexpensive and does not require a power source in a sewer pipe, the flow velocity can be measured, and unknown water can be detected at low cost. Moreover, since it is not necessary to always measure the flow velocity for detecting unknown water, after collecting the wireless IC tag reader 3, it can be stored not in the sewer pipe 1 but in another place. In this embodiment, the wireless IC tag reader 3 may be inserted into the sewer pipe 1 as required for detecting the flow velocity, and deterioration of the detection means can be suppressed.

  FIG. 2 is a diagram showing a second embodiment of the present invention. A wireless IC tag 4 is installed on the inner wall of the sewer pipe 1. The wireless IC tag 4 includes a circuit unit including at least an IC chip and an antenna unit. The surface of the wireless IC tag 4 is waterproofed, and the communication distance of the antenna portion is changed depending on the thickness of the waterproof coating. The wireless IC tag 4-1 has the longest communication distance, and the communication distance becomes shorter in the order of the wireless IC tag 4-2 and the wireless IC tag 4-3.

The wireless IC tag reader 3 is configured in the same manner as in the first embodiment, but the wireless IC tag reader 3 of this embodiment does not have a storage unit for storing the communication time and elapsed time with the wireless IC tag 4. Also good. Although not shown, the wireless IC tag reader 3 is collected downstream of the sewer pipe 1 as in the first embodiment, and the data is taken into data analysis means (not shown) configured by a computer or the like. The data analysis means can obtain the installation position of the wireless IC tags 4-1 to 4-3 and distance information for communication, and further stores an IC tag database (not shown) for storing data such as the diameter of the installed sewer pipe 1. Information).

  The unknown water detection method by the data analysis means of a present Example is demonstrated.

  The data analysis means extracts the wireless IC tag 4 with communication data from the data stored in the wireless IC tag reader 3 and obtains information on the communication distance of the wireless IC tag 4.

  The data analysis means obtains information on the distance from the installation position of the wireless IC tag 4 to the bottom surface from the IC tag database. When the wireless IC tag 4 is installed at the top, the diameter of the sewer pipe 1 may be used.

  Based on this information, the data analysis means calculates the water level of the sewer pipe 1. The water level calculation method is described below. When there is no communication data with all of the wireless IC tags 4-1 to 4-3, the data analysis unit sets the water level as a range D in FIG. When there is only communication data with the wireless IC tag 4-1, the water level is in the range C, and when there is communication data with the wireless IC tags 4-1 and 4-2, the water level is in the range B. When there is communication data with all of the IC tags 4-1 to 4-3, the water level is determined as the range of A.

The data analysis means obtains the water level range from A to D as described above. The distance from the installation position of the wireless IC tag 4 to the bottom surface is E, the communication distance of the wireless IC tag 4-1 is 11, the communication distance of the wireless IC tag 4-2 is 12, and the wireless IC tag 4-3. Let l3 be the communication distance. The water level in the range of D is between 0 and (E-11), and the water level in the range of C is from (E-11) to (E-11).
During l2), the water level in the range of B is between (E-12) and (E-13), and the water level in the range of A is between (E-13) and E.

  Next, the data analysis means determines the presence or absence of unknown water. The data analysis means accumulates the measurement result of the water level, and determines that there is an inflow of unknown water upstream of the wireless IC tag 4 when the water level has increased by at least two stages with respect to the average value. Since the wireless IC tag 2 is fixed and the distance from the installation position to the bottom surface does not change, even if it is determined that there is an inflow of unknown water when the number of communication of the wireless IC tag 4 increases. good.

  In addition, the data analysis means inputs rainfall data from the rainfall database in the basin of the sewer pipe 1 and determines the presence or absence of unknown water from the relationship between the rainfall data and the flow velocity.

  An example of the determination method is shown below. The data analysis means plots the relationship between the rainfall and the flow velocity as shown in FIG. When the result shows that the flow velocity tends to increase with respect to the rainfall as shown in FIG. 8, for example, linear approximation is performed, and the slope of the approximated straight line is compared with the reference value. A reference value of 2 is appropriate, and if it exceeds the reference value, it is determined that there is an inflow of unknown water upstream of the wireless IC tag.

  In addition, when the water level increases as a result of adding a new pipeline to the sewer pipeline 1, the water is not determined to be unknown.

  Further, by performing both the detection of the water level range according to the present embodiment and the calculation of the flow velocity according to the first embodiment, the sewage amount of the sewer pipe 1 can be calculated, and the unknown water amount can be estimated directly.

  According to the present invention, by installing a wireless IC tag that is inexpensive and does not require a power source in a sewer pipe, the water level can be measured and unknown water can be detected at low cost. Further, since it is not necessary to always measure the water level for detecting unknown water, the wireless IC tag reader 3 can be collected and stored in a place other than the sewer pipe 1. In the present embodiment, the deterioration of the detection means can be suppressed by inserting the wireless IC tag reader 3 into the sewer pipe 1 as required for water level detection.

  FIG. 3 is a diagram showing a third embodiment of the present invention. In this embodiment, the method for measuring the water level is different from that in the second embodiment. A wireless IC tag 2 is installed on the inner wall of the sewer pipe 1. The configuration of the wireless IC tag 2 is the same as that of the first embodiment.

  The wireless IC tag reader 33 has the same configuration as that of the wireless IC tag reader 3 of the second embodiment. However, a plurality of communication antennas 5 having different communication distances are installed, and the wireless IC tag reader 33 is connected to each communication antenna. Save the communication record. In the present embodiment, a case where there are three types of communication antennas 5-1 to 5-3 will be described as an example.

  Although not shown, the wireless IC tag reader 33 is collected downstream of the sewer pipe 1 as in the second embodiment, and the data is taken into data analysis means (not shown) constituted by a computer or the like. The data analysis means can obtain information from an IC tag database (not shown) that stores data such as the distance that the communication antennas 5-1 to 5-3 can communicate and the diameter of the installed sewer pipe 1.

  A method for calculating the water level by the data analysis means of this embodiment will be described. The data analysis means extracts the communication antenna 5 having communication data from the data stored in the wireless IC tag reader 33 and obtains information on the communication distance of the communication antenna 5. The communication distance of the communication antenna 5 is preferably a distance from the water line of the wireless IC tag reader 33. The communication distance of the communication antenna 5-1 is γ, the communication distance of the communication antenna 5-2 is β, and the communication distance of the communication antenna 5-3 is α.

  The data analysis means obtains information on the distance from the installation position of the wireless IC tag 2 to the bottom surface from the IC tag database. When the wireless IC tag 2 is installed at the top, the diameter of the sewer pipe 1 may be used. In this embodiment, E is the distance from the installation position of the wireless IC tag 2 to the bottom surface.

  The data analysis means is such that the water level when there is no communication data for all of the communication antennas 5-1 to 5-3 is between 0 and (E-α), and the water level when there is only communication data for the communication antenna 5-1. Is between (E-α) and (E-β), and when there is communication data of the communication antennas 5-1 and 5-2, the water level is between (E-β) and (E-γ), The water level when there is communication data for all the communication antennas 5-1 to 5-3 is determined to be between (E-α) and E. The method for determining the presence or absence of unknown water by the data analysis means is the same as in Example 2.

  According to this embodiment, by installing an inexpensive wireless IC tag that does not require a power source in the sewer pipe, the water level can be measured, and unknown water can be detected at a low cost. In addition, since it is not necessary to always measure the water level for detecting unknown water, the wireless IC tag reader 33 can be collected and stored in a place that is not in the sewer pipe 1. In the present invention, if the water level detection is necessary, the wireless IC tag reader 33 may be inserted into the sewer pipe 1 to suppress the deterioration of the detection means.

  FIG. 4 is a diagram showing a fourth embodiment of the present invention. In this embodiment, the method for measuring the water level is different from that in Embodiment 2 and Embodiment 3. A plurality of wireless IC tags 6 are installed around the inner wall of the sewer pipe 1. The configuration of the wireless IC tag 6 is the same as that of the first embodiment. The wireless IC tag reader 3 has the same configuration as that of the second embodiment, and can communicate with all the wireless IC tags 6-1 to 6-4 and store the data when the water level is almost zero. If the antenna part of the wireless IC tag reader 3 is at the upper part, the water level rises and the wireless IC tag 6 is submerged, it can communicate with the wireless IC tag 6 that is positioned below the wireless IC tag reader 3. Disappear. For example, the wireless IC tag 6-4 cannot communicate with the water level shown in FIG.

  Although not shown, the wireless IC tag reader 3 is collected downstream of the sewer pipe 1 as in the first embodiment, and the data is taken into data analysis means (not shown) configured by a computer or the like. The data analysis means is information from an IC tag database (not shown) that stores data such as the installation position of the wireless IC tag 6-1 to the wireless IC tag 6-4 and the height from the bottom of the sewer pipe 1. Is available.

  Below, the calculation method of the water level by the data analysis means of a present Example is described. The data analysis means extracts the wireless IC tag 6 having communication data from the data stored in the wireless IC tag reader 3.

  The data analysis means obtains information on the distance from the installation position of the wireless IC tag 6 to the bottom surface from the IC tag database. Since the wireless IC tag 6-1 is installed at the top, it corresponds to the diameter of the sewer pipe 1. The distance from the bottom of the wireless IC tag 6-2 is a, the wireless IC tag 6-3 is b, and the wireless IC tag 6-4 is c.

  In the data analysis means, when there is communication data of all the wireless IC tags 6-1 to 6-4, the water level is between 0 and c, and when there is communication data of the wireless IC tags 6-1 to 6-3. The water level is between c and b, and when there is communication data of wireless IC tags 6-1 to 6-2. The water level is between b and a, and there is only communication data of wireless IC tag 6-1. When there is no communication data between a and full water, it is determined that the water is full. The method for determining the presence or absence of unknown water by the data analysis means is the same as in Example 2 and Example 3.

  According to this embodiment, by installing an inexpensive wireless IC tag that does not require a power source in the sewer pipe, the water level can be measured, and unknown water can be detected at a low cost. Furthermore, if the water level detection is necessary, the wireless IC tag reader 3 may be inserted into the sewer pipe 1 to suppress the deterioration of the detection means.

  FIG. 5 shows a wireless IC tag reader 333 according to the fifth embodiment of the present invention. The difference from the wireless IC tag readers of the first to fourth embodiments is that a water quality sensor 7 is provided below the water line. The water quality sensor 7 can measure at least one of pH, turbidity, chromaticity, water temperature, and organic substance concentration. The wireless IC tag reader 333 can measure the quality of sewage with the water quality sensor 7 when communicating with a wireless IC tag (not shown) and store the value.

  Although not shown, the wireless IC tag reader 333 is collected downstream of the sewer pipe 1 as in the first embodiment, and the data is taken into data analysis means (not shown) configured by a computer or the like. Further, a water sampling mechanism may be provided instead of the water quality sensor 7, and sewage is sampled during communication with the wireless IC tag. The quality of sewage collected at the time of collection by the wireless IC tag reader 333 may be analyzed.

  A method for detecting unknown water by data analysis means will be described. Since unknown water can be groundwater or rainfall, its quality is different from that of sewage. In the present embodiment, paying attention to the difference in water quality, when the water quality changes greatly, it is determined that there is an inflow of unknown water upstream of the point. For example, when turbidity is used, the turbidity of sewage is 100 degrees or more, while the groundwater is 1 degree or less. For this reason, when unknown water flows in, turbidity will fall. When the turbidity decreases to 50%, it can be determined that there is an inflow of unknown water upstream thereof. Since this example can be used in combination with Example 1 to Example 4, the detection sensitivity of unknown water can be improved by using it together.

  According to the present embodiment, it is possible to grasp the water quality of an arbitrary sewer pipe provided with a wireless IC tag, and to detect unknown water at a low cost. Moreover, if the wireless IC tag reader 333 is inserted into the sewer pipe as required for water quality measurement, the deterioration of the detection means can be suppressed.

  FIG. 6 shows a wireless IC tag reader 11-1 according to a sixth embodiment of the present invention. The difference from the wireless IC tag readers of the first to fifth embodiments is that the communication antenna 11-2 and the distance measuring means 11-3 are provided above the draft line of the wireless IC tag 11-1. The distance measuring unit 11-3 includes an ultrasonic sensor.

  The wireless IC tag reader 11-1 communicates with the wireless IC tag 11-4 installed on the inner wall of the sewer pipe 1, stores the communication data, and the wireless IC tag reader 11 by the distance measuring unit 11-3. -1 and the inner wall of the sewer pipe 1 are measured, and the data is stored. Although not shown, the wireless IC tag reader 11-1 is collected downstream of the sewer pipe 1, and the data is taken into data analysis means (not shown) configured by a computer or the like. The data analysis means obtains information from an IC tag database (not shown) that stores data such as the installation position of the wireless IC tag 11-4 and the height from the bottom of the sewer pipe 1.

  A method for detecting unknown water by data analysis means will be described. The data analysis means obtains the height information from the bottom of the sewer line 1 where the wireless IC tag 11-4 with communication data is installed from the data stored in the wireless IC tag reader 11-1 from the IC tag database. Get from. The data analysis means subtracts the distance between the inner wall of the sewer pipe 1 and the IC tag reader 11-1 when communicating with the wireless IC tag 11-4 from the height from the bottom of the sewer pipe 1. The subtracted value can be regarded as the water level of the sewer line 1.

  The data analysis means determines the presence or absence of unknown water. The data analysis means accumulates the above-mentioned water level measurement results, and determines that there is an inflow of unknown water upstream of the wireless IC tag 11-4 when the water level has increased by at least 1.5 from the average value. To do. By simultaneously calculating the water level according to the present embodiment and the flow velocity according to Embodiment 1, the amount of sewage in the sewer pipe 1 can be calculated, and the amount of unknown water can be estimated directly.

  According to the present embodiment, it is possible to grasp the water level of an arbitrary sewer pipe in which a wireless IC tag is installed, and to detect unknown water at a low cost. Further, if the water quality measurement is necessary, the wireless IC tag reader 11-4 may be inserted into the sewer pipe to suppress the deterioration of the detection means.

  FIG. 7 shows an unknown water detection system in Embodiment 7 of the present invention. Sewage flows in a sewer pipe 1 made of a PVC pipe or a fume pipe buried in the ground. A wireless IC tag writer 8 is installed on the inner wall of the sewer pipe 1. The wireless IC tag writer 8 includes at least an antenna for communicating with the wireless IC tag 9, a circuit unit including a CPU and a memory, and a power supply unit. The power supply unit may be a battery or receive power from an electric wire. The surface of the wireless IC tag writer 8 is waterproofed so that it does not easily deteriorate in the sewer pipe 1. The wireless IC tag writer 8 is installed at the upper part of the inner wall of the sewer pipe 1.

  The wireless IC tag 9 includes a circuit unit including at least an IC chip and an antenna unit. The surface is waterproofed, floats in sewage, and an antenna is installed above the draft line so that it can communicate with the wireless IC tag writer 8. In order to adjust the buoyancy, a buoyancy adjustment unit (not shown) made of plastic or the like is installed.

  The wireless IC tag 9 flows down in accordance with the flow of sewage, and communicates sequentially from the wireless IC tag writer 8-1 on the upstream side to the wireless IC tag writers 8-2 and 8-3. The wireless IC tag writer 8 writes information for identifying the wireless IC tag writer 8 and information on the time of communication to the wireless IC tag 9 in communication with the wireless IC tag 9. Although not shown, the wireless IC tag 9 is collected at a pump station or a sewage treatment plant provided downstream of the sewer pipe 1. Further, the sewer pipe 1 may be recovered by providing a recovery mechanism. In the wireless IC tag 9, data written after collection is taken into data analysis means (not shown) constituted by a computer or the like. The data analysis means can obtain information from an IC tag database (not shown) that stores data such as the installation positions and intervals of the wireless IC tag writers 8-1 to 8-3, the installed sewer pipes 1 and the like. .

  Below, the unknown water detection method by a data analysis means is demonstrated. The data analysis means identifies the wireless IC tag writer 8 from the data written in the wireless IC tag 9 and obtains the time of passage.

The data analysis means obtains data on the installation distance between the wireless IC tag writer 8-1 and the wireless IC tag writer 8-2, and the wireless IC tag writer 8-2 and the wireless IC tag writer 8-3 from the IC tag database.

  Based on these pieces of information, the data analysis means determines the flow rate between the wireless IC tag writer 8-1 and the wireless IC tag writer 8-2, and between the wireless IC tag writer 8-2 and the wireless IC tag writer 8-3. Calculate the flow rate. The determination of the presence or absence of unknown water by the data analysis means is performed in the same manner as in the first embodiment.

  According to the present embodiment, by flowing down a wireless IC tag that is inexpensive and does not require a power source, the flow velocity can be measured, and unknown water can be detected at low cost. Further, if the wireless IC tag 9 is inserted into the sewer pipe 1 as required for detecting the flow velocity, the deterioration of the detecting means can be suppressed.

  FIG. 8 shows an unknown water detection system according to the eighth embodiment of the present invention. Sewage flows in a sewer pipe 1 made of a PVC pipe or a fume pipe buried in the ground. A wireless IC tag reader 10 is installed on the inner wall of the sewer pipe 1. The wireless IC tag reader 10 includes an antenna for communicating with at least the wireless IC tag 9, a circuit unit including a CPU and a memory, and a power supply unit. The power supply unit may be a battery or receive power from an electric wire. The surface is waterproofed and has a structure that does not easily deteriorate in the sewer pipe 1. The wireless IC tag reader 10 is installed on the upper part of the inner wall of the sewer pipe 1.

  The wireless IC tag 9 includes a circuit unit including at least an IC chip and an antenna unit. The surface is waterproofed, floats in sewage, and an antenna is installed above the draft line so that it can communicate with the wireless IC tag reader 10. In order to adjust the buoyancy, a buoyancy adjustment unit (not shown) made of plastic or the like is installed.

The wireless IC tag 9 flows down according to the flow of sewage, and sequentially communicates with the wireless IC tag readers 10-2 and 10-3 from the upstream wireless IC tag reader 10-1. The wireless IC tag reader 10 stores information on the time when the wireless IC tag 9 communicated. Although not shown, the wireless IC tag reader 10 has a function of communicating stored information, and communication data is taken into data analysis means (not shown) configured by a computer or the like. Further, the data analysis means can obtain information from an IC tag database (not shown) that stores information on the installation intervals of the wireless IC tag readers 10-1 to 10-3. In the present embodiment, unlike the sixth embodiment, there is no need to collect the wireless IC tag 9. The flow rate calculation method by the data analysis means is calculated from the time based on the difference between the installation interval of the wireless IC tag reader 10 and the communication time. The determination of the presence or absence of unknown water is the same as in Example 7.

  According to the present embodiment, by flowing down a wireless IC tag that is inexpensive and does not require a power source, the flow velocity can be measured, and unknown water can be detected at low cost. Further, if the wireless IC tag 9 is inserted into the sewer pipe 1 as required for detecting the flow velocity, the deterioration of the detecting means can be suppressed.

It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 1 of this invention. It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 2 of this invention. It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 3 of this invention. It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 4 of this invention. It is a front view which shows a part of detection part of the unknown water detection system which is Example 5 of this invention. It is a cross-sectional view which shows the detection part of the unknown water detection system which is Example 6 of this invention. It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 7 of this invention. It is a longitudinal cross-sectional view which shows the detection part of the unknown water detection system which is Example 8 of this invention. It is a figure which shows the detection result of a flow velocity or a water level.

Explanation of symbols

1 Sewer pipes 2, 4, 6, 9 Wireless IC tags 3, 10, 33, 333 Wireless IC tag reader 5 Communication antenna 7 Water quality sensor 8 Wireless IC tag writer

Claims (10)

A plurality of wireless IC tag installed on the inner wall of the sewer pipe, the IC tag database for storing data of the installation position and the installation interval of the wireless IC tag, the communication time of the previous SL wireless IC tag, or the A storage unit is provided for recording the elapsed time from the communication with the first wireless IC tag and information for specifying the wireless IC tag as data at the time of communication of the wireless IC tag. The wireless IC tag reader that flows down, the data recorded in the storage unit and the flow rate between the wireless tags from the data of the installation position and the installation interval of the wireless IC tag stored in the IC tag database, An unknown water detection system comprising data analysis means for comparing the calculated flow velocity with an average value to determine the presence or absence of unknown water which is rainwater or groundwater other than sewage . A plurality of wireless IC tags with different communication distances installed on the inner wall of a sewer pipe, an IC tag database for storing data on the installation positions of the wireless IC tags, communication distance information between the wireless IC tags, and the A wireless IC tag reader having a storage unit for recording information for identifying a wireless IC tag as data and flowing down in the sewer pipe, and data stored in the storage unit and stored in the IC tag database Calculate the range of the water level from the data of the installed position of the wireless IC tag and the communication distance information, and compare the calculated range of the water level with the average value to determine whether there is rainwater other than sewage or unknown water that is groundwater An unknown water detection system comprising data analysis means for determining . A plurality of wireless IC tags installed on the inner wall of a sewer pipe, an IC tag database for storing data on the installation position of the wireless IC tag, and a plurality of communication antennas having different communication distances are installed. A wireless IC tag reader having a storage unit for recording information for specifying an IC tag and communication information as data and flowing down in the sewer pipe, data recorded in the storage unit, and the IC tag database Calculate the water level range from the stored wireless IC tag installation position data and communication information, and compare the calculated water level range with the average value to determine whether there is rainwater other than sewage or unknown water that is groundwater An unknown water detection system comprising data analysis means for determining . Identifies a plurality of waterproof IC tags installed circumferentially on the inner wall of a sewer pipe, an IC tag database for storing data on the installation positions of the wireless IC tags, and the wireless IC tags A wireless IC tag reader having a storage unit for recording information and communication information as data and flowing down in the sewer pipe, the data recorded in the storage unit and the IC tag database stored in the IC tag database Data analysis that calculates the range of the water level from the wireless IC tag installation position data and communication information, and compares the calculated water level range with the average value to determine the presence or absence of unknown water that is rainwater or groundwater other than sewage An unknown water detection system characterized by comprising means .   The unknown water detection system according to any one of claims 1 to 4, wherein the wireless IC tag reader is waterproofed, an antenna for communication with the wireless IC tag is installed on an upper surface, and the antenna is floated on water. An unknown water detection system comprising a buoyancy adjustment unit for adjusting buoyancy so that an antenna is above a water surface. The unknown water detection system according to any one of claims 1 to 5, wherein when the wireless IC tag reader communicates with the wireless IC tag, the pH of sewage in the water sampling mechanism or the sewer pipe for sampling sewage A water quality meter that measures at least one of turbidity, chromaticity, water temperature, and organic matter concentration is provided, and it is determined that there is an inflow of unknown water when the water quality measured by the water quality meter changes. An unknown water detection system.   The unknown water detection system according to any one of claims 1 to 6, further comprising distance measuring means for measuring a distance, wherein when the wireless IC tag reader communicates with the wireless IC tag, the distance measuring means An unknown water detection system characterized by measuring a distance between an inner wall of the sewer pipe and the wireless IC tag reader. A plurality of wireless IC tag writer installed at the inner wall of the sewer pipe, and an IC tag writer database that stores data of the installation position and the installation interval of the wireless IC tag writer, emerged the sewerage conduit, said wireless Information for specifying the wireless IC tag writer by the IC tag writer and the time information that has flowed down are written, the wireless IC tag that flows down, the data recorded in the wireless IC tag, and the data stored in the IC tag database Calculate the flow velocity between the wireless tag writers from the installation position and interval data of the wireless IC tag writer, and compare the calculated flow velocity with the average value to determine the presence of rainwater other than sewage or unknown water that is groundwater An unknown water detection system characterized by comprising a data analysis means . A wireless IC tag that floats in a sewer pipe and communicates with a wireless IC tag reader, and a plurality of wireless ICs installed on the inner wall of the sewer pipe that stores time information communicated with the wireless IC tag Tag reader, IC tag reader database for storing data of installation position and installation interval of the wireless IC tag reader, data recorded in the wireless IC tag reader, and installation of the wireless IC tag reader stored in the IC tag database A data analysis means for calculating the flow velocity between the wireless tag readers from the position and installation interval data, and comparing the calculated flow velocity with the average value to determine the presence or absence of rainwater other than sewage or unknown water that is groundwater is provided. An unknown water detection system characterized by that. The unknown water detection system according to any one of claims 2 to 9, further comprising a database of rainfall in the basin of the sewer pipe, and determining the presence or absence of unknown water from the relationship between the rainfall in the database and the range of flow velocity or water level. An unknown water detection system characterized by that.

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