JP5842071B1 - Sewage pipe flowing water detection device and detection method - Google Patents

Abstract

An object of the present invention is to improve the accuracy in specifying the location of abnormal water intrusion in a sewer pipe. An apparatus for detecting flowing water in a sewage pipeline, a temperature detection unit, a water pressure detection unit, a control unit, and a storage unit for simultaneously storing a plurality of detected values of temperature and water pressure at predetermined time intervals. 12, a transmission / reception unit 13 and a watertight detection box 6 are provided, and a temperature detection unit, a water pressure detection unit, a control unit, a transmission / reception unit, and a storage unit are provided inside the detection box, and the detection box 6 is installed in the sewer pipe 1 In this case, the detection surface 8a of the water pressure detection unit 8 is provided on the downstream side surface 6d of the detection box 6, and the detection surface 8a detects the downstream water pressure change so that the change in the water level can be detected. It is configured. [Selection] Figure 1

Description

  The present invention collects rainwater from sewage sewage pipes and roads that drain domestic sewage discharged from facilities such as homes, buildings, and factories laid in urban areas, etc. to rivers and lakes. When abnormal water that is different from sewage that normally flows in the sewage pipe enters the sewage pipe for rainwater, etc., the detection device of the flowing water state in the sewage pipe to be used for specifying the intrusion location of the abnormal water and It relates to a detection method.

  Sewage sewage pipes and sewage sewage pipes laid in urban areas are generally laid along the road, but on the upstream side there are many branch pipes with relatively small diameters, These branch pipes communicate with a main pipe having a large diameter laid on the downstream side of the pipe. In such sewage pipes, a lot of eaves or manholes having lids that can be opened and closed are installed for maintenance. Amber is often installed in the tip area of branch pipes buried near houses and factories, and manholes are in the middle of branch pipes, in the middle of main pipes, or in junctions between branch pipes or in junctions of branch pipes and main pipes. Installed.

  In urban areas, many sewer pipes for sewage and sewer for rainwater are laid in a mesh pattern, and they are often arranged along the same road. Therefore, for example, a part of the sewage sewage pipe is mistakenly connected to a part of the sewage sewage pipe, or vice versa. A connection error such as an example in which a part of the connection is made may occur in various places. Also, in sewer pipes that have been buried for a long period of decades, abnormalities such as damage have occurred at the joints of the main pipe and the joints between the pipes and branch pipes due to aging and earthquakes, etc. A groundwater or rainwater inflow accident has occurred. In general, since the sewage pipes are buried in the ground after construction, the location where such an abnormality has occurred cannot be easily found from the outside.

  In this way, rainwater or groundwater that enters the sewer pipe for sewage due to incorrect connection or damage to the pipe, or sewage or groundwater that enters the sewage pipe for stormwater is different from the water that originally flows down ( In order to solve this problem, some countermeasures such as repair of the sewer pipe and repair work are required.

  In particular, rainwater and groundwater flowing into the sewage sewage pipes should not be purified at the sewage treatment plant, and this inflow increases the cost of treatment. And if there is an inflow of sewage that exceeds the planned treatment capacity of the sewage treatment plant, it will be discharged into rivers and lakes in the state of untreated sewage, which will be a source of water pollution problems. In addition, if there is a damaged part in the pipeline, the sewage leaks from there to the underground ground outside the pipeline, causing the problem of soil and groundwater contamination, and solving this problem becomes important.

  Various attempts have been made in the past to identify the location of misconnection or damage in the sewage pipeline that is the source of these problems.

  Patent Document 1 discloses a method for specifying an intrusion location of abnormal water. The method of patent document 1 installs the detection apparatus which has a temperature detection part in the several places of a sewer pipe, memorize | stores two or more temperature at predetermined time intervals, and after progress of a predetermined detection period (for example, 1 to 2 months) Each detection device is collected from the sewer pipe, and the recorded temperature change data is transmitted to the data processing device by electromagnetic wave communication. The data processing device compares the normal temperature change data stored and stored in advance for each specific sewage pipeline with the transmitted temperature change data, and if there is a difference in temperature change between the two, In this method, it is determined that abnormal water has entered the place of the water pipeline. The normal temperature of sewage and rainwater varies from season to season, but groundwater does not change much. These normal temperatures are stored in advance in the data processor for each season and time.

  On the other hand, as a method of identifying the location of abnormal water intrusion in the sewage pipeline, the flow rate change of the sewage flow in the sewage pipeline is detected by the water level change, and the abnormal water level change state that deviates from the normal water level change is detected, and the detection data There is also known a method for identifying an abnormal water intrusion place by a data processing device based on the above. That is, a normal water level change (flow rate change) in a sewage pipeline, for example, a daily expected water level change in a specific pipeline, and a water level change detected by a water level detection device are compared by a data processing device. This is a method for identifying the location of abnormal water intrusion in the water pipeline.

Japanese Patent No. 4756092

  When identifying the location of abnormal water intrusion in sewage pipes, the method of comparing temperature change data detected in specific sewage pipes with temperature change data stored and stored in advance is abnormal with high accuracy in various sewage pipes. It is possible to specify the place where water enters. However, depending on the sewage pipeline, the mixing temperature of each sewage or the like that merges from each place may change with the passage of day or time so that it differs from the normal temperature predicted in advance. In addition, there may be no significant difference between the original sewage temperature and the temperature of abnormal water, and in such a sewage pipe, the accuracy of specifying the location of abnormal water may decrease.

  On the other hand, in the method of identifying the intrusion location of abnormal water only by changing the water level in the sewage pipeline, normal flow rate changes such as sewage may not match the predicted range. For example, unforeseen abnormal changes often occur in the sewage that joins from various places. In such sewage pipes, the accuracy of specifying the location of abnormal water may decrease.

  Furthermore, a general water level meter is relatively expensive and requires a considerably large installation space, and it is not easy to install it in a sewage pipe having a small diameter. In addition, since the structure of a water level meter that detects a water level with high accuracy in millimeters is more complicated, problems such as installation space and cost become larger.

To solve these various problems, the present invention is water flow detection apparatus that can detect and store both the flowing water of a temperature change and pressure change through the sewer pipe, and provides a running water detection method using the same To do.

When the flowing water detection device of the present invention is installed in a sewer pipe, even with a sewer pipe where an unpredictable disturbance element may occur as described above, two detection data recorded simultaneously with temperature and water pressure Even if an abnormal phenomenon occurs in one of the detected data of temperature and water pressure , if the other detected data is a normal value, it is determined that the abnormal phenomenon is a disturbance element and not an intrusion of abnormal water. Is easy, and the error of specifying the location of abnormal water entry is greatly reduced.

For example, domestic sewage from toilets and bathrooms is discharged into sewage sewer pipes, and the sewage temperature is generally higher than that of rainwater and groundwater. Sometimes rainwater inflows lowers the temperature of sewage and increases the flow rate, which increases the water level. Currently, the Japan Meteorological Agency and many local governments publish data on the date and amount of rainfall that occurred in each region, for example, the temperature of sewage in the lower pipe measured by the above method before and after the rain. If there is a change in the water pressure , it can be determined that rainwater is flowing into the sewer pipe as abnormal water.

In view of the above background, the first invention of the present invention is an apparatus that is installed at the bottom of a sewage pipe and detects flowing water in the sewage pipe, and includes a temperature detection unit, a water pressure detection unit, a control unit, temperature and water pressure. A plurality of detection values simultaneously stored at predetermined time intervals, a transmission / reception unit, and a watertight detection box, and the temperature detection unit, the water pressure detection unit, the control unit, the transmission / reception unit, and the inside of the detection box, A storage unit is provided, and the detection box has a bottom surface, an upper surface, and side surfaces in a state in which the detection box is installed in the sewer pipe, and both left and right side surfaces to which the flowing water is divided are formed in an arc shape.

When the detection box is installed at the bottom of the sewer pipe, a detection surface of the water pressure detection unit is provided on a side surface of the detection box located on the downstream side of running water, and the water pressure change on the downstream side of the detection box on the detection surface. the by detecting being adapted to be converted into flowing water of the water level changes in the sewer pipe, the detection data detected simultaneously flowing water temperature and water pressure in the detection box installation position at a predetermined time interval in the storage unit It is constituted so that it can memorize (claim 1).

The second aspect of the present invention uses the detection device of the first aspect of the present invention, and simultaneously detects a plurality of temperatures and water pressures of flowing water flowing through the sewage pipe line at predetermined time intervals, thereby determining the flowing water state of the sewage pipe line. A detection method, wherein the detection device is installed at the bottom of a sewer pipe or at the bottom of a manhole or dredge installed in a sewer pipe (Claim 2 ).

A first aspect of the present invention includes a temperature detection unit, a water pressure detection unit, a control unit, a transmission / reception unit, a storage unit, and a watertight detection box, and the temperature detection unit, the water pressure detection unit, the transmission / reception unit, A control unit and a storage unit are provided, and a detection surface of the water pressure detection unit is provided on the downstream outer surface on the downstream side of the sewer pipe in the detection box, and the detection surface detects a change in water pressure downstream of the detection box. It is configured so that it can be converted into a change in the level of running water.

The detected water pressure (hydrostatic pressure) value can be converted directly into the water level. In this way, the water pressure is detected by a water pressure detector that can be miniaturized, and by providing both a temperature detector and a water pressure detector in one detection box, these detectors are compared to the case where they are configured as independent boxes. Thus, the outer shape of the detection device is extremely reduced, and the flowing water detection device can be easily installed even in a narrow installation space in the sewer pipe.

In addition, since the temperature and water pressure (corresponding to the water level) can be detected and recorded at the same installation location in the sewer pipe, the correlation between the temperature change and the water pressure change at the same time in flowing water can be detected accurately, and the predetermined detection period has elapsed Later, the detected data can be processed by a data processing device or the like. As a result, even in sewage pipelines where disturbance factors such as temperature changes or water pressure changes that cannot be predicted occur, the presence or absence of abnormal water intrusion can be identified and determined with high accuracy by using both detection data. It becomes possible. In particular, in the case of abnormal water intrusion due to rainwater, since the rain actually generated around the area is greatly related, it can be determined with higher accuracy by using data related to the rain.

  Furthermore, when the detection box is installed in the sewer pipe, the water pressure detection surface of the water pressure detection unit is provided on the downstream side surface of the detection box located downstream of the running water. The influence of water pressure and turbulent flow is remarkably reduced, and only the hydrostatic pressure value of the flowing water can be detected with high accuracy, whereby water level data converted from the water pressure can be obtained with high accuracy values.

In addition , the detection box has a bottom surface, an upper surface, and side surfaces in a state where it is installed in the sewer pipe, and both left and right side surfaces to which the flowing water is divided are formed in an arc shape, and a water pressure detection unit is formed on the downstream side surface. water pressure detection surface of that provided.

  When the detection box has such a shape, the flowing water on both sides of the arc shape flows smoothly downstream, so that the generation of local turbulence in that portion is suppressed and the measurement data is stabilized.

According to a second aspect of the present invention, by using the detection device according to any one of the above-described aspects, a plurality of temperatures and water pressures of flowing water flowing through the sewage pipeline are simultaneously recorded at predetermined time intervals, thereby detecting the flowing water in the sewage pipeline. In the method, the detection device is installed at the bottom of a sewer pipe or the bottom of a manhole or dredger installed in the sewer pipe.

  According to this method, even in sewage pipelines where disturbance factors such as unpredictable temperature changes or water level changes occur, the presence or absence of abnormal water intrusion can be determined by using both temperature and water pressure (water level) detection data. Can be identified and determined with high accuracy.

It is a systematic diagram which shows one example of the sewer pipe which installed the flowing water detection apparatus of this invention. It is the side view and top view which show typically one example of the flowing water detection apparatus of this invention installed in the sewer pipe line of FIG. It is the top view and side view which show the state which installed the flowing water detection apparatus of this invention in the sewer pipe line by the installation member. It is a systematic diagram of the flowing water detection apparatus of the present invention.

Next, the best mode of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing an example of a sewage pipe in which a flowing water detection device (hereinafter simply referred to as “detection device”) of the present invention is installed. The sewer pipe 1 includes a main pipe 2 and a branch pipe 3, and flowing water flows from the upstream side to the downstream side of the branch pipe 3 and the main pipe 2 as indicated by arrows. Appropriate place of the main pipe 2 or the branch pipe 3, or the confluence point of the main pipe 2 and the branch pipe 3, the manhole 4 are installed for maintenance.

  As shown in the figure, branch pipes 3 having a smaller diameter often join a part of the branch pipe 3 having a larger diameter, and a trough or the like (not shown) is appropriately installed on the upstream side of the branch pipe 3 having a smaller diameter. Often done. The detection device 5 of the present invention is installed on the bottom surface of the main pipe 2 or the branch pipe 3 or the manhole 4.

In the case of a sewage pipe for sewage, for example, when a sewage pipe for rainwater is erroneously connected to part A of the right branch pipe 3 in FIG. It is preferable to perform analysis by analyzing detection data of temperature change and water pressure (water level) change of the sewage before and after the rain by rain data at a plurality of locations along the pipe 3 and in the vicinity of the junction to the main pipe 2 on the downstream side. However, it is performed by analyzing detection data of temperature changes and water pressure (water level) changes at two locations in the branch pipe 3 before and after the minimum portion A is sandwiched.

On the other hand, when the B portion of the left branch pipe 3 in FIG. 1 is damaged and groundwater enters from the outside, the intrusion location of the abnormal water is specified by detecting devices at two locations of the branch pipe 3 sandwiching at least the B portion. 5 is performed by analyzing detection data of temperature and water pressure (water level) changes. Data analysis is performed by the data processing device 20 described later. The temperature of running water in the sewage pipeline with the infiltration of groundwater tends to be lower than the temperature of the sewage pipeline only for domestic sewage without the intrusion of abnormal water, which makes it possible to identify abnormal water.

  On the other hand, the same applies to the sewage pipe for rainwater. For example, when the sewage sewage pipe is misconnected to the portion A of the right branch pipe 3 in FIG. 1, or the left branch pipe 3 in FIG. If the B part is damaged and groundwater enters from the outside, normal rainwater pipes are used for rainwater, so rainwater does not enter the sewage pipes in fine weather. Changes in detection data occur due to inflow of sewage. Even if there is rainfall, the detection data changes. These make it possible to specify the location of abnormal water intrusion.

  2A is a side view of the detection device 5 of the present invention installed on the bottom surface 1a of the sewage pipe 1 of FIG. 1, and FIG. 2B is a plan view thereof. The detection device 5 includes a detection box 6, and the detection box 6 has a circular cross section, a flat top surface 6 a and a bottom surface 6 b, and an upstream side surface 6 d to which the hydraulic pressure of running water from the upstream side is applied. The left and right side surfaces 6c, which are in contact with the flow of water flowing from the upstream side, are both formed in an arc shape. A water pressure detection surface 8 a of the water pressure detection unit 8 is provided on the downstream side surface 6 d of the detection box 6.

  The upstream side surface 6d may have a trapezoidal shape other than the arc shape, or may be a flat surface perpendicular to the flowing water depending on the case. Even if some turbulent flow is generated by such a flat surface, the turbulent flow is reduced by the left and right side surfaces 6c on the downstream side.

  The detection box 6 is usually formed of a hard resin material in a watertight manner, but in some cases, both side surfaces 6c may be formed of a metal material such as stainless steel having corrosion resistance. The detection device 5 of the present invention can be formed extremely small. In the actually manufactured example, the size of the detection box 6 is about 27 mm in diameter and about 12 mm in height. Therefore, even if the bottom surface 6b of the detection box 6 is formed on a flat surface, the arc-shaped bottom surface of the sewage pipe having a significantly different diameter can be regarded as a substantially flat surface suitable for it, so that it can be stably installed on the bottom surface. it can.

  Inside the detection box 6, the temperature detection unit 7, the water pressure detection unit 8, the control unit 11 and other members are housed in a fixed state. The temperature detection surface 7a of the temperature detection unit 7 is disposed on the inner surface of the upper surface 6a of the detection box 6, the body of the water pressure detection unit 8 is disposed inside the detection box 6, and the portion of the water pressure detection surface 8a extending from the body is provided. The side 6d is exposed to the outside of the detection box 6 and comes into contact with running water. Thus, by exposing the water pressure detection surface 8a, it is possible to measure the water pressure with high accuracy. The detection box 6 can be made of metal or resin.

  The flowing water flowing outside the detection box 6 flows down along the upper surface 6a and both side surfaces 6c of the detection box 6 as shown by arrows in FIGS. 2A and 2B, but the upper surface 6a side is along this surface. The two side surfaces 6c are divided from the upstream side and flow along the side surface 6c in a smooth flow. Therefore, local turbulence generation near the detection box 6 is suppressed as much as possible, and the hydrostatic pressure detection surface 8a is not substantially affected by dynamic water pressure or turbulent flow from the upstream side, and only the hydrostatic pressure corresponding to the water level is accurate. To be applied.

  FIG. 3 is a schematic view showing an example in which the detection device 5 of the present invention is installed in the sewer pipe 1 by the installation member 10. The same parts as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted. The installation member 10 has a flat bottom plate 10a and a side plate 10b extending vertically upward from the bottom plate 10a. As shown in FIG. 3 (a), the side plate 10b is formed in an arc shape in accordance with the upstream side surface of the detection box 6 on the upstream side of the running water, and from both ends of the arc portion to the downstream side, respectively. The linear flat side plates 10b are extended in parallel with each other, and both end portions of the linear side plates 10b are bent inward at a small angle (for example, an angle θ of about 30 to 40 degrees). It should be noted that there is a sufficient opening between both ends of the bent side plate 10b, so that the water pressure detection surface 8a is in contact with running water even when the water level is lower than the height of the side plate 10b. In this way, by bending the both end portions of the linear side plate 10b inward at a small angle, the occurrence of turbulent flow on the downstream side due to flowing water flowing along the outside of the side plate 10b is suppressed. This is the same effect as the arc-shaped side surfaces 6c of the detection box 6 in FIG.

  The installation member 10 is formed of a metal material or a resin material, and a part of the bottom plate 10a is provided with a bolt hole for fixing to the bottom portion 1a of the sewage pipe 1 or an engagement portion with a rope or the like as necessary. You can also.

  When the installation member 10 as shown in FIG. 3 is used, the flowing water smoothly flows along the outer surface of the side plate 10b of the installation member 10, so that a more stable hydrostatic pressure is applied to the water pressure detection surface 8a.

  FIG. 4 is a system diagram of the detection device 5 of the present invention. The detection device 5 includes a temperature detection unit 7, a water pressure detection unit 8, a control unit 11, a storage unit 12, and a transmission / reception unit 13. The control unit 11 includes a CPU and the like, and is connected to the temperature detection unit 7, the water pressure detection unit 8, and the transmission / reception unit 13 via the analog / digital conversion unit 14. The storage unit 12 stores a plurality of temperature and water pressure detection data simultaneously at predetermined time intervals, and has a capacity of, for example, 512 Kbit and can store about 12,000 measurement points. A clock unit 15 is provided to store a plurality of temperature and water pressure detection data at a predetermined time interval in the storage unit 12, and for example, a storage signal in which a measurement interval is set between 1 minute and 256 minutes is sent to the control unit 11. The control unit 11 sends the signal to the storage unit 12.

  The power supply unit 16 supplies power to the control unit 11 and other parts. For example, a lithium battery is used. The transmission / reception unit 13 includes an antenna unit 13a, and performs electromagnetic wave communication with the external data processing device 20 through the antenna unit 13a. These parts excluding the power supply unit 16 can be formed on, for example, the same integrated substrate, and are fixed inside the detection box 6 with the periphery of the substrate sealed with resin.

The data processing device 20 is configured by a computer system, and includes an antenna and a transmission / reception unit for electromagnetic wave communication with the transmission / reception unit 13. When installing a large number of detection devices 5 in the sewer pipe 1, information such as measurement intervals is transmitted from the data processing device 20 to each detection device 5 in advance by electromagnetic wave communication, and each detection device is acquired at the time of data acquisition. The data stored in 5 is transmitted to the data processing device 20 by electromagnetic wave communication and stored in the storage unit inside the data processing device 20. The abnormal water location can be detected by comparing the accumulated data of the temperature and water pressure (water level) before, during and after the rain at the date and time of the rain. It is to be noted that the abnormality portion can be specified by storing the data, such as the season of each sewage pipeline, the temperature for each hour, the water level, etc. in the storage unit in advance in the data processing device 20 with the relationship with the recorded data. . Therefore, it is possible to compare the accumulated data with the detected data of the temperature and water pressure (water level) received from each detection unit 5 and output the comparison result data to the output unit.

  The apparatus for detecting a flowing water state in a sewage pipe of the present invention can be used to identify a location where a flowing water (abnormal water) different from the original flowing water enters the sewage pipe.

DESCRIPTION OF SYMBOLS 1 Sewer pipe 1a Bottom surface 2 Main pipe 3 Branch pipe 4 Manhole 5 Detection apparatus 6 Detection box 6a Upper surface 6b Bottom surface 6c, 6d Side surface 7 Temperature detection part 7a Temperature detection surface 8 Water pressure detection part 8a Water pressure detection surface 10 Installation member 10a Bottom plate 10b Side plate 11 Control unit 12 Storage unit 13 Transmission / reception unit 13a Antenna unit 14 Analog-digital conversion unit 15 Clock unit 16 Power supply unit 20 Data processing device

Claims (2)

A device installed at the bottom of a sewage pipeline to detect the flowing water in the sewage pipeline, and a temperature detection unit, a water pressure detection unit, a control unit, and a memory for storing a plurality of detected values of temperature and water pressure simultaneously at predetermined time intervals Unit, transmitter / receiver unit and watertight detection box,
The temperature detection unit, the water pressure detection unit, the control unit, the transmission / reception unit and the storage unit are provided inside the detection box,
The detection box has a bottom surface, an upper surface and a side surface in a state where it is installed in a sewer pipe, and both left and right side surfaces from which running water is diverted are formed in an arc shape
When the detection box is installed at the bottom of the sewer pipe, a detection surface of the water pressure detection unit is provided on a side surface of the detection box located on the downstream side of running water, and the water pressure change on the downstream side of the detection box on the detection surface. the by detecting being adapted to be converted into flowing water of the water level changes in the sewer pipe, the detection data detected simultaneously flowing water temperature and water pressure in the detection box installation position at a predetermined time interval in the storage unit A flowing water detection device for a sewage pipe used for detecting abnormal water generated in a sewage pipe, which is configured to be memorized . A method for detecting the flow of water in a sewage pipeline by simultaneously storing a plurality of detected values of the temperature and water pressure of the flowing water flowing through the sewage pipeline at predetermined time intervals using the running water detection device according to claim 1. A method for detecting the flowing water in a sewage pipe, characterized in that the detection device is installed at the bottom of a sewage pipe or at the bottom of a manhole or tub installed in the sewage pipe.

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