JP2011106113A - Method for specifying infiltration place of abnormal water in sewer pipeline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify an infiltration place of abnormal water in a sewer pipeline such as a rainwater pipeline or a soil water pipeline by a sure, reliable and simple method. <P>SOLUTION: A first method for specifying the infiltration place of abnormal water in the sewer pipeline as the method for specifying the infiltration place of abnormal water in the sewer pipeline 1, includes installing temperature recording devices 8 recording temperature in the sewer pipeline 1 every preset time, at a plurality of places along the downstream side to the upstream side of the sewer pipeline 1, recording the temperature in the sewer pipeline 1 by the respective temperature recording devices 8 for a predetermined period, collecting the respective temperature recording devices 8 from the respective installation places after recording is terminated, comparing temperature histories recorded in the respective collected temperature recording devices 8, and specifying the infiltration of abnormal water upstream from the installed place of the temperature recording device 8 that has recorded the temperature history different from the normal temperature range of original flowing water in the sewer pipeline 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for efficiently identifying an abnormal water intrusion place in a sewer pipe.

  Most sewerage pipes in the current urban area are classified into rainwater pipes and sewage pipes. The rainwater pipe has a main pipe laid along a large road and a number of branch pipes appropriately connected to the main pipe. The branch pipes are extended to a small alley in a residential area. In the rainwater pipeline, the rain that falls on the road or the roof of the building first flows into the branch pipe from the side gutter, etc., then joins the main pipe from each branch pipe, and is left untreated from the outlet at the most downstream of the main pipe. , Discharged into lakes, oceans, etc.

  The sewage pipe also has a main pipe laid along a large road and a number of branch pipes appropriately connected to the main pipe. The branch pipes are stretched down to a small alley in a residential area. Communicating with drainage outlets of various offices and facilities such as buildings, restaurants, etc., from these drainage outlets, sewage due to domestic wastewater including E. coli discharged from toilets, kitchens, washrooms, canteens, bathrooms, etc. It flows into the branch pipe. The most downstream of the sewage pipe line communicates with a sewage treatment plant, and the sewage is purified there before being discharged into rivers, lakes and oceans.

  The rainwater pipe and the sewage pipe have concrete and plastic pipes constituting main pipes and branch pipes, and manholes distributed along the pipes. These manholes are appropriately placed in the middle of the main pipe and branch pipes, or at the connection between the main pipe and the branch pipes, and are used for inspection and maintenance work in the pipes.

  In a normal state, only rainwater, which is the original running water, flows through the rainwater pipe, and only sewage, which is the original running water, flows through the sewage pipe. However, unexpected abnormal water may infiltrate into the rainwater pipes or sewage pipes due to misconnection of other pipes or cracks in the pipes.

  For example, there have been reports at various places where the rainwater pipe is connected to the sewage pipe. In other words, since the branch pipes that make up the rainwater pipeline are stretched down to a small alley in a residential area, it may be laid adjacent to the sewage pipeline that should be connected to the sewage pipes of ordinary houses. There are many examples of accidents that connect to the branch pipes of many rainwater pipes. There is also an example in which a sewage pipe from a general house is erroneously connected to a rainwater pipe. As a result of these misconnections, the sewage that has entered the rainwater pipes is discharged into the rivers and the like without being purified, and a bad odor, a strange odor, water pollution, etc. occur at the discharge place or in the vicinity thereof, which becomes a social problem.

  Such inflow of sewage into the rainwater pipe is usually detected from bad odor (or odor) at the discharge point to the river or the like which is the end of the rainwater pipe or discoloration around the discharge port. When it is discovered from the state of the discharge location that there is an erroneous connection of the sewage pipeline somewhere in the rainwater pipeline, it is necessary to identify (detect) the erroneous connection location and disconnect the sewage pipeline.

  In addition, cracks that occur in the pipes that make up the rainwater pipes, or gaps or breakage that cause water leakage in the rainwater pipes, such as leaks from connecting parts between pipes, damaged parts of the pipe main bodies, or connecting parts between pipes and manholes When this occurs, groundwater enters the rainwater pipes buried underground as abnormal water through gaps in the surrounding soil. The infiltrated groundwater usually does not contain harmful substances, so it can generally be discharged into rivers in a mixed state with rainwater. However, groundwater leaking from cracks and connections in pipes also causes soil and sand in the soil outside the pipes to flow out into the pipes, so that voids are created in the soil that holds the pipes as underground structures. This can cause road subsidence and depression. Therefore, it is desirable to repair before the voids in the soil are expanded, and for that purpose, it is necessary to identify the intrusion location of groundwater by some method and make it normal.

  On the other hand, there are many examples in which rainwater pipes are mistakenly connected to sewage pipes. Sewage in sewage pipelines is purified at sewage treatment plants, but in recent years, a large amount of rainwater with an hourly rainfall exceeding 50 to 100 mm, such as guerrilla-type torrential rain that has been generated nationwide, has entered sewage pipelines. If it flows in, it temporarily exceeds the treatment capacity of the sewage treatment plant, causing a situation in which part of the sewage must be discharged into a river or the like in an untreated state. Therefore, it is necessary to identify the location where the rainwater pipe is incorrectly connected to the sewage pipe as soon as possible and to disconnect the rainwater pipe.

  In addition, there were gaps that caused leakage in the sewage pipes, such as gaps or breakage that occurred in the pipes that make up the sewage pipes, or leakage from the connection parts between the pipes or the connection parts between the pipes and the manholes. Occasionally, groundwater infiltrates as abnormal water through a gap in the soil around the sewage pipe buried underground. Such cracks in pipes and leakage of groundwater from the connection affect not only the same problem as the rainwater pipe but also the treatment capacity of the treatment plant. In addition, since the sewage flowing in the pipes flows out from the gaps and broken parts of the pipe culvert and causes soil to groundwater contamination problems, it is desirable to repair them before they expand. It is necessary to identify the place where groundwater enters by the method.

  Conventionally, there are two methods for specifying the location of abnormal water intrusion into a sewer pipe: a method that relies on manpower and a method that uses a measuring device. The manual identification method uses the main manhole that makes up the sewer line, and then visually checks the inflow of abnormal water and the traces that appear to have entered the past from the downstream to the upstream. First, the most upstream manhole location where main water is thought to have flowed in is identified. Next, the intrusion of abnormal water is visually confirmed in the same manner as the main pipe by going back the branch pipe connected to the specified manhole or the vicinity thereof, and finally the intrusion place is specified.

  In addition, as a method of using measurement equipment, a flow meter is installed in the pipeline to identify the intrusion location due to changes in flow rate and flow velocity, and the inside of the pipeline is inspected and photographed with a TV camera mounted on a self-propelled robot. There is a way to do it.

  In the case of a manual identification method, for example, when a sewage pipe is misconnected to a rainwater pipe, sewage from a general house is only discharged intermittently. There are very few opportunities for visual confirmation. In addition, it is not allowed to continue monitoring with the manhole installed on the roadway open for a long time. In addition, there is a problem that it takes time and effort, and a great deal of cost is required.

  Furthermore, the sewage that flows intermittently through the rainwater pipe is often washed away by rainwater during the rain, and traces of contamination once generated in the pipe often disappear. For this reason, there is a limit in identifying the erroneous connection place of the sewage pipe by visual inspection. In addition, when groundwater enters the rainwater pipeline, the groundwater level changes, so there is no guarantee that the groundwater always flows through the rainwater pipeline. For this reason, it is often difficult to specify the location of groundwater infiltration in the rainwater pipeline.

  On the other hand, in sewage pipes, sewage flows into the pipes from many general houses and facilities. However, even though the sewage flowing into the sewage pipes is intermittent, the sewage flows into a continuous flow when many of them join together. Therefore, since there is always a continuous flow in the sewage pipe, it is difficult to distinguish between sewage and rainwater by a method that relies on humans even when rainwater is invading, and it is difficult to specify the location where rainwater enters.

  Furthermore, in the sewage pipeline, as in the case of the rainwater pipeline, it is often difficult to specify the place where the groundwater enters.

  In addition, in the method of using measurement equipment in rainwater and sewage pipes, when measuring with a flow meter, it is necessary to install a flow meter, connect a recorder and power supply, and secure a power supply for the measuring instrument. Since the number of units increases, the measurement takes a lot of time and the total cost is enormous. In addition, the method using a TV camera is effective as a method when the range to identify the location of abnormal water intrusion narrows, but it takes a huge amount of money to investigate the entire pipeline, and the location of rainwater ingress However, it is difficult to conduct timely surveys.

  Therefore, conventionally, it has been demanded to specify a place where abnormal water enters in sewer pipes such as rainwater pipes and sewage pipes with a reliable and reliable method, and from measurement to identification by a simple method.

  The method for specifying an abnormal water intrusion place in the first sewer pipe of the present invention that solves the above-described problem (hereinafter simply referred to as “specific method”) is a method for specifying an abnormal water intrusion place in the sewer pipe in advance. A temperature recording device that records the temperature in the sewer pipe at every specified time is installed at a plurality of locations along the upstream side from the downstream side of the sewer pipe, and the temperature inside the sewer pipe is measured by each temperature recording device. Record for a predetermined period, collect each temperature recording device from the installation location after recording, compare the temperature history recorded in each collected temperature recording device, and normal temperature of the original running water in the sewer pipe It is characterized in that abnormal water is infiltrated upstream from the place where the temperature recording device in which the temperature history different from the range is recorded is installed.

  The second identification method is the first identification method, wherein a sewer pipe is provided with a plurality of manholes distributed from the downstream side to the upstream side of the sewer pipe, and crosses the manhole. A temperature recording device is installed at the bottom near the manhole connecting portion of the flow path or pipe.

  The third identification method is the above-described first or second identification method, wherein the sewer pipe is composed of a main pipe and a branch pipe. First, the temperature recording device is arranged from the downstream side to the upstream side of the main pipe. The temperature inside the main pipe is recorded for a predetermined period with each temperature recording device, and each temperature recording device is collected from each installation location after the recording is completed, and then recorded on each collected temperature recording device. The temperature history of the temperature recording device installed on the most upstream side where the temperature history different from the normal temperature range of the original flowing water in the main pipe is recorded is identified, and then the temperature recording device of the identified temperature recording device is identified. The temperature recording device is installed at a plurality of locations along the upstream side from the downstream side of the main pipe at the installation site or the branch pipe connected to the immediate upstream side of the main pipe. Normal temperature range of natural flowing water Is characterized in that different temperature histories are identified as abnormal water upstream of the location where you installed temperature recorder recorded is entering.

  Further, the fourth identification method is that in any one of the first to third identification methods described above, when the sewer pipe is a rainwater pipe, abnormal water is generated in the sewage that has entered due to incorrect connection of the sewage pipe or in the pipe It is characterized by being groundwater that has infiltrated from a gap or a damaged part.

  Further, the fifth identification method is that in any one of the first to third identification methods described above, when the sewer pipe is a sewage pipe, abnormal water is generated in rainwater that has entered due to incorrect connection of the rainwater pipe, or in the pipe It is characterized by being groundwater that has infiltrated from a gap or a damaged part.

  In addition, the sixth identification method is the one of the first to fifth identification methods described above, in which the rainwater pipe laid in the area where the abnormal water intrusion site is identified flows from the road into the rainwater mass through the side groove. If it is configured to flow further into the culvert that constitutes the rainwater pipeline, a temperature recording device is installed in the rainwater mass, and the rainwater temperature falling in the area is recorded for a predetermined period. After the completion, the temperature recording device is recovered from the installation location, and then the temperature history recorded in the recovered temperature recording device is used as the normal temperature range of rainwater for the identification.

  A seventh specifying method is the above-described first to sixth specifying method, wherein the temperature measuring device includes a power supply unit, a temperature detecting unit, and a temperature measurement value by the temperature detecting unit for each preset time. A transmission / reception unit for performing electromagnetic wave communication between a recording unit for recording and a control device for identification is provided. The control device performs electromagnetic wave communication between the control unit, the storage unit, the output unit, and each temperature measurement device. The control unit performs control for transmitting an electromagnetic wave for transmission request to each temperature recording device via the transmission / reception unit, and stores the temperature history received from each temperature recording device via the transmission / reception unit in the storage unit. The control unit stores the temperature, and the control unit performs control to output the temperature history stored in the storage unit to the output unit.

  The first identification method of the present invention is a method for identifying an abnormal water intrusion place of a sewer pipe, and a temperature recording device for recording the temperature in the sewer pipe at every preset time. Installed at a plurality of locations along the upstream side from the downstream side, and records the temperature in the sewer pipe line for a predetermined period with each temperature recording device, collects each temperature recording device from each installation location after the recording, Comparing the temperature history recorded in each collected temperature recording device, abnormalities upstream from the location where the temperature recording device where the temperature history different from the normal temperature range of the original running water in the sewer pipe is recorded It is characterized by specifying that water has infiltrated.

  The temperature of the original running water flowing into the sewer pipes, for example, the rainwater temperature in the case of rainwater pipes, and the temperature of sewage in the case of sewage pipes tend to vary depending on the time zone, season, etc. It is clear from various survey data that both temperatures are different from each other even in the season. And the temperature of rainwater and sewage may show some ups and downs in a short time, but if you look at the average value in the range of several days or weeks, it will be in a relatively narrow temperature range (normal temperature range) . The groundwater temperature does not change much even when the region and season change, and it is known that it is lower than the normal temperature range of sewage.

  In the first specific method of the present invention, a plurality of temperature recording devices are installed along the upstream side from the downstream side of the sewer pipe, the temperature in the pipe is recorded for a predetermined period every predetermined time, and installed. The temperature history recorded in each temperature recording device collected from the place is compared. And when there is a temperature recording device that records a temperature history different from the normal temperature range of the original running water of the sewer pipe, abnormal water with a different temperature (upstream from the location where the temperature recording device is installed) It can be specified that water other than the original running water has entered.

  In the second specifying method of the present invention, in the first specifying method, the sewer pipe is provided with a pipe trough and a plurality of manholes distributed from the downstream side to the upstream side of the pipe trough. In this case, a temperature recording device can be installed in the flow path crossing the manhole or in the bottom near the manhole connecting portion of the pipe rod.

  When the temperature recording device is installed in the flow path crossing the manhole or in the bottom portion near the manhole connecting portion of the pipe, the temperature recording device can be easily installed in the pipeline. Near the bottom of the manhole, an inflow side pipe tub and an outflow side pipe tub are connected, and a channel crossing the manhole is formed on the line connecting them, but by installing a temperature recording device in the channel It is possible to measure the water temperature (flowing water temperature) in a state of flowing in the pipe line. Also, when a temperature recording device is installed at the bottom of the pipe rod near the manhole connection, the temperature of the water flowing through the pipe can be measured in the same manner.

  In the third specifying method of the present invention, in the above first or second specifying method, when the sewer of the sewer pipe line is constituted by a main pipe and a branch pipe, first, the temperature recording device is connected from the downstream side of the main pipe. Installed at a plurality of locations along the upstream side, records the temperature in the main pipe for a predetermined period with each temperature recording device, collects each temperature recording device from each installation location after the recording, and then collects each temperature recording device The temperature history recorded in the main pipe is compared, the temperature history different from the normal temperature range of the original flowing water in the main pipe is recorded, the location of the temperature recording device installed on the most upstream side is identified, and then the above-mentioned identified The temperature recording device is installed at a plurality of locations from the downstream side to the upstream side of the main pipe at the installation location of the temperature recording device or the branch pipe connected to the immediate upstream side thereof, and the same method as the main pipe The original running water in the branch pipe Upstream of the location where a different temperature history and normal temperature range is set up temperature recording device is recorded, it can be identified as abnormal water is infiltrated.

  This identification method first identifies the place where abnormal water infiltrates in the main pipe (the place where the water enters from the branch pipe connected to the place), and then abnormal water in the branch pipe connected thereto. This is a two-stage method for specifying the intrusion location (intrusion source). According to this method, since it is not necessary to install a temperature recording device in all of the many branch pipes connected to the main pipe, it is possible to quickly and inexpensively and efficiently identify the place where abnormal water has entered. become.

  Further, according to a sixth identification method, in any one of the first to fifth identification methods described above, a rainwater pipe laid in an area where an abnormal water intrusion site is identified flows into the rainwater mass from the road through a side groove. In the case where the rainwater pipe is further configured to flow into the pipes constituting the rainwater pipe, a temperature recording device is installed in the rainwater mass into which only rainwater flows, and the rainwater temperature falling in the area is determined in advance. The temperature recording device is collected from the installation location after the recording is completed, and then the temperature history recorded in the collected temperature recording device can be used as the normal temperature range of rainwater for the above-mentioned specification.

  Only rainwater flows into the rainwater mass, and there is virtually no inflow of other miscellaneous water. Therefore, the accurate (standard) rainwater normal temperature range in the area where there was rainfall can be obtained from the temperature history recorded with the temperature recorder installed in the rainwater mass. It is possible to specify the location where rainwater enters the sewage pipeline or the location where sewage enters the stormwater pipeline.

  Further, according to a seventh specifying method, in any one of the first to sixth specifying methods, the temperature measuring device includes a power supply unit, a temperature detecting unit, and a temperature measurement value by the temperature detecting unit for each preset time. A transmission / reception unit that performs electromagnetic wave communication between the recording unit that performs recording and the control device that performs identification can be provided.

  Moreover, the said control apparatus can be provided with the transmission / reception part which performs electromagnetic wave communication between a control part, a memory | storage part, an output part, and each temperature measurement apparatus. And the control part in a control apparatus performs control which transmits the electromagnetic wave of a transmission request to each temperature recording device via a transmission / reception part, and memorize | stores the temperature history received via the transmission / reception part from each temperature recording apparatus in a memory | storage part. It is possible to perform control and to output the temperature history stored in the storage unit to the output unit.

  The temperature recording device that can transmit the temperature history recorded with the control device to the control device by electromagnetic waves by electromagnetic wave communication can be made completely waterproof because it is not necessary to pull out the communication wiring etc. to the outside, It is possible to immerse in running water in the sewer pipe for a long time.

It is a systematic diagram which shows typically the sewer pipe line which applies the abnormal water identification method of this invention. It is sectional drawing which shows an example of a temperature measuring apparatus typically. It is a figure which shows the example which installs a temperature recording apparatus in a sewer pipe. It is the example which installed the temperature recording device in the manhole by the fixing method shown in FIG. 3 with respect to the rainwater pipe as a sewer pipe. It is the example which installed the temperature recording device in the manhole by the fixing method shown in FIG. 3 with respect to the sewage pipe line as a sewer pipe line. It is sectional drawing which shows the other method of installing a temperature recording apparatus in a sewer pipe, (a) shows the state which fixed the cap-shaped fixing tool to the wall of a sewer pipe or the wall of a manhole, (b) FIG. 5 is a view showing a state in which a temperature recording device is fitted to a fixture fixed to a wall surface. It is a block diagram of a temperature measuring device and a block diagram of a control device. A part of the temperature history in the rainwater pipeline stored in the storage unit of the control device is displayed in an analog manner. A part of the temperature history in the sewage pipeline stored in the control device storage unit is displayed in analog form.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a system diagram schematically showing a sewer pipe to which the abnormal water identification method of the present invention is applied. In this embodiment, the sewer pipe line 1 is constituted by a main pipe 2 having a large diameter and a plurality of branch pipes 3 connected to the main pipe 2, and an opening 4 at the most downstream (terminal) end of the main pipe 2 is a discharge part 5. Communicating with Further, some of the branch pipes 3 directly connected to the main pipe 2 branch (or merge) with other branch pipes 3.

  Manholes 6 are dispersedly arranged at appropriate locations such as a middle part of the main pipe 2, a connection part between the main pipe 2 and the branch pipe 3, a middle part of the branch pipe 3, a connection part between the branch pipe 3 and the branch pipe 3. FIG. 1 shows an example in which an abnormal water intrusion site exists in the branch pipe 3 on the right side of the drawing connected to the third manhole 6 portion from the discharge part 5 of the main pipe 2 toward the upstream side. That is, on the branch pipe 3 on the right side of the drawing, there is a pipe 7 different from the pipe (the sewage pipe 7 when the sewer pipe 1 is a storm water pipe and the storm water pipe 7 when the sewer pipe 1 is a sewage pipe). An example in which there is an intrusion place 7a where groundwater infiltrates from a gap such as a crack or the like exists in the branch pipe 3 on the right side of the drawing when the connection is incorrect. A temperature measuring device 8 indicated by a black circle is attached to an appropriate portion of the sewer pipe 1, for example, a flow path crossing the manhole 6 or a bottom portion near the manhole connecting portion of the pipe tub.

  There are two types of sewer pipes, a rainwater pipe and a sewage pipe. For example, in the case of a rainwater pipe, rainwater masses M are provided at appropriate intervals along a side groove of the road as shown in the figure. Only rainwater from the lateral groove flows into the rainwater mass M, and communicates with the branch pipe 3 of the rainwater pipe line by a pipe line indicated by a dotted line. A temperature recording device 8 can also be installed in the rainwater mass M (for the purpose described later).

  FIG. 2 is a cross-sectional view schematically showing an example of the temperature measuring device 8. The temperature measurement device 8 includes a power supply unit 10, a temperature detection unit 11, a recording unit 12 that records temperature measurement values of the temperature detection unit 11 at preset time intervals, and an electromagnetic wave signal requested to be transmitted from a control device described later. And a transmission / reception unit 13 for transmitting the temperature history recorded in the recording unit 12 to the control device to be described later.

  The transmission / reception unit 13 includes a transmission / reception circuit 13a and an antenna 13b connected thereto. The power supply unit 10, the temperature detection unit 11, the recording unit 12, and the transmission / reception unit 13 are accommodated in a waterproof sealed container 14 having electromagnetic wave permeability such as a reinforced plastic. The sealed container 14 has a container-like main body 15 and a lid 15a, and both are sealed by adhesion after housing the internal device, or are detachably sealed by bolts, screws, or the like via a seal layer. It becomes.

  Such a temperature measuring device 8 is commercially available, for example, as an ultra-compact data logger for temperature (type TELID 3T Plus, etc.) from Micro Sensys, Germany. This commercially available temperature measuring device includes a temperature sensor, a rechargeable battery, and a storage unit with a data capacity of 16 Kbit to 256 Kbit, can be arbitrarily set at 1800 to 8000 measurement points, and a measurement interval of 1 minute to 255 minutes. (Transmission / reception distance) 0 to 5 mm, lead time 2 seconds, corresponding OS: Windows (registered trademark), each component is housed in a sealed plastic container.

  The manhole 6 has a main body made of concrete or reinforced plastic, and a removable metallic lid that closes the opening at the top, and a working ladder or the like is provided inside the main body. The main body is embedded in the road, and only the lid is exposed on the road surface.

  FIG. 3 is a diagram showing a specific example in which the temperature recording device 8 is installed in the sewer pipe. In this example, the temperature recording device 8 is supported by, for example, the peripheral wall 6a of the manhole 6 so that the temperature recording device 8 does not flow downstream by a fixture 8c configured by connecting a fixing portion 8b to both ends of a chain (or rope) 8a. It is like that. One of the fixing portions 8b is fixed to the sealed container 14 of the temperature recording device 8 by bonding, bolts, or the like, and the other of the fixing portions 8b is fixed to the peripheral wall 6a by bonding, bolts, or the like. The fixing position of the fixing portion 8b on the peripheral wall 6a is preferably higher than the highest water level in the manhole 6.

  When recovering the installed temperature recording device 8, the fixing portion 8b fixed to the peripheral wall 6b is removed or the fixing portion 8b fixed to the temperature recording device 8 is removed. When the fixing portion 8b fixed to the temperature recording device 8 is removed, the fixing device 8c can be reused when the temperature recording device 8 is installed again at a later date.

  FIG. 4 shows an example in which the temperature recording device 8 is installed in the manhole 6 by the fixing method shown in FIG. 3 with respect to the rainwater pipe as the sewer pipe 1. The manhole 6 is connected to a rainwater inflow side pipe (in the illustrated example, a pipe that constitutes the branch pipe 3) at two locations on the right side and the right side of the drawing. In the example shown in the figure, pipes constituting the branch pipe 3 are connected. The bottom surface 6b of the manhole 6 installed in the rainwater pipeline is located below the bottom surface of the pipe tube to be connected, and solid matter such as fallen leaves flowing in along with the rainwater is retained at the bottom of the manhole 6, and the manhole 6 is regularly The solid matter can be removed from.

  In the present embodiment, the temperature recording device 8 measures the temperature of the flowing water flowing into the manhole 6 from two locations. Therefore, the temperature recording device 8 is not installed below the bottom surface level of the pipe connected to the manhole 6 so as not to be affected by the presence or absence of accumulated water at the bottom of the manhole 6, and upstream in the flow path of flowing water across the manhole 6. Installed in two places on the side. Note that the right temperature recording device 8 shown in FIG. 4 tends to be tilted by being pushed to the left side by flowing water from the right side, but there is no problem in temperature measurement.

  FIG. 5 shows an example in which the temperature recording device 8 is installed in the manhole 6 by the fixing method shown in FIG. 3 with respect to the sewage pipeline as the sewer pipeline 1. The manhole 6 is connected to a sewage inflow side pipe tub (in the example shown, a pipe tub constituting the branch pipe 3) at two locations on the right side of the drawing and a side perpendicular thereto, and on the left side of the drawing ( In the example shown in the figure, pipes constituting the branch pipe 3 are connected. And the bottom surface 6b of the manhole 6 installed in the sewage pipe line and the bottom surface of the pipe rod connected to it are at substantially the same level, and downward from the connecting portion of each pipe rod toward the center of the bottom surface of the manhole 6. An invert 6c is formed on the bottom surface of the manhole 6 so that an inclined channel is formed. The shape of the invert 6 c is such that the sewage flowing into the manhole 6 does not cause turbulent flow and smoothly flows toward the downstream pipe so that solid matter does not stay at the bottom of the manhole 6. As shown in the figure, the flow path formed with a predetermined width between the lower edges of the opposing inverts 6 c is a flow path of running water that crosses the manhole 6. And the temperature recording device 8 is installed in the position which can measure the flowing water temperature of the flow path.

  FIG. 6 is a cross-sectional view showing another method for installing the temperature recording device 8 in the sewer pipe 1. FIG. 6A is a cross-sectional view of the cap-like fixture 16 in the sewer pipe 1 (main pipe 2 or branch pipe). 3 shows a state in which the temperature recording device 8 is fixed to the wall surface 17 of the installation place of the manhole 6 or (b) shows a state in which the temperature recording device 8 is fitted to the fixture 16 fixed to the wall surface 17.

  Next, the installation procedure of the temperature recording device 8 in FIG. 6 will be described. First, as shown in FIG. 6A, the bottom surface of the fixture 16 is aligned with a predetermined position of the wall surface 17, and the fixture 16 is fixed to the wall surface 17 with a concrete screw-type anchor bolt 18. Next, the temperature recording device 8 is pushed into the cap of the fixture 16 as shown in FIG. At that time, the temperature detector 11 side of the temperature recording device 8 shown in FIG.

  As the wall surface 17 for installation shown in FIG. 6, even if the sewer pipe line 1 is a rainwater pipe line or a sewage pipe line, the peripheral wall 6a portion in contact with the flow path formed in the lower part of the manhole 6 or the manhole 6 The bottom surface of the invert 6c near the connecting portion of the pipe rod to be connected is desirable.

  In order to collect the temperature recording device 8 shown in FIG. 6 after the temperature recording is completed, the upper portion of the temperature recording device 8 may be grasped with a gripping tool and pulled upward from the fixing tool 16. The fixture 16 remaining on the wall surface 17 may be removed, but can be reused when the temperature recording device 8 is installed next time as it is.

  FIG. 7 is a block diagram showing a circuit system of the temperature measuring device 8 shown in FIG. 2 and a block diagram showing a circuit system of the control device 20 that transmits and receives information to and from the temperature measuring device 8. The temperature measurement device 8 includes a power supply unit 10, a temperature detection unit 11, a recording unit 12, and a transmission / reception unit 13. The recording unit 12 includes a CPU 12a, a storage unit 12b, a clock unit 12c, and A / D conversion units 19a and 19b. The unit 13 includes a transmission / reception circuit 13a and an antenna 13b composed of windings. The power supply unit 10 includes a battery such as a lithium ion battery and a voltage stabilization circuit, the temperature detection unit 11 includes a temperature sensor and an amplifier circuit such as a thermistor and a thermocouple, and the recording unit 12b is a rewritable semiconductor memory device. The timepiece unit 12c has a crystal oscillation type timepiece circuit.

  The control device 20 includes a power supply unit 21, a transmission / reception unit 22, a control unit 23, and a storage unit 24. The transmission / reception unit 22 includes a transmission / reception circuit 22a and an antenna 22b composed of windings, and the control unit 23 includes a CPU 25 and an input. Section 26, output section 27, and A / D conversion section 28. The power supply unit 21 includes a battery power source such as a lithium ion battery or a commercial power source and a voltage stabilization circuit, the input unit 26 includes a keyboard or a touch panel, the output unit 27 includes a liquid crystal display or a printer, and the storage unit 24 includes It is composed of a rewritable semiconductor memory device. Next, the identification procedure of the abnormal water intrusion location identification method of the present invention will be described.

(When the sewer pipe is a rainwater pipe)
When the sewer pipe line 1 shown in FIG. 1 is a rainwater pipe line, when a bad smell (or strange odor) indicating sewage outflow or a trace of sewage is found in the discharge part 5 of the main pipe 2, sewage is somewhere in the rainwater pipe line. It is estimated that the pipe is misconnected, but there are the following two methods for specifying the misconnected location.

  The first method is a one-stage method in which a plurality of temperature measuring devices 8 are attached to appropriate portions of the main pipe 2 and the branch pipe 3 as shown in FIG.

  In the second method, first, a plurality of temperature measuring devices 8 are attached to appropriate locations along the main pipe 1 from the downstream side to the upstream side, and the temperature history of the temperature measuring devices 8 is compared to compare the temperature history of the main pipe 2. Identify where the sewage flowed in, and then attach a plurality of temperature measuring devices 8 to the specified location of the main pipe 2 or an appropriate location of the branch pipe connected to the immediate upstream side thereof, and these temperature measuring devices 8 is a two-stage method in which the temperature history of 8 is compared and the location of the erroneous connection of the sewage pipe in the branch pipe 3 is specified.

(In the case of one-step system)
First, the necessary number of temperature measuring devices 8 are prepared, and the control device 20 sets the recording start time, recording interval, and the like of the temperature measurement values. Specifically, A / D conversion is performed from the input unit 26 of the control device 20 in a state where the antenna 22b of the control device 20 is close to the antenna 13b of the first temperature measurement device 8 to be set (communication by electromagnetic waves). Various setting signals are transmitted as analog signals to the transmitting / receiving unit 13 of the temperature measuring device 8 via the unit 28 and the transmitting / receiving unit 22. The CPU 12a of the temperature measuring device 8 sends the setting information of the measurement start time and the recording interval to the storage unit 12b of the recording unit 12 based on the setting signal received as a digital signal via the transmission / reception unit 13 and the A / D conversion unit 19b. Store. Similar setting operations are sequentially performed on all necessary temperature measuring apparatuses 8.

  For example, when using the temperature measuring device 8 commercially available from the Microsensys Co., Ltd., a maximum of 8000 temperature measurement values can be recorded in the recording unit 12. Therefore, for example, when recording every 5 minutes, 5 minutes × In the case of recording every 8000 times = 40000 minutes (28 days), it is possible to record each period of 3 minutes × 8000 times = 24000 minutes (16 days).

  In addition to the above settings, the control device 20 transmits to each temperature measuring device 8 installation location information such as a name, symbol, or number indicating the installation location. Specifically, the installation location information is input from the input unit 26 of the control device 20 and transmitted to the temperature measurement device 8, and the CPU 12a of the temperature measurement device 8 stores the information in the storage unit 12b. As will be described later, this information is transmitted from the temperature measuring device 8 to the control device 20 together with the temperature history, and is used for associating the temperature history with the installation location of the temperature measuring device 8.

  Next, a plurality of preset temperature measuring devices 8 are sequentially installed at appropriate locations on the main pipe 2 and the branch pipe 3. When the temperature measurement start time preset by the time information by the clock unit 12c is reached, the CPU 12a converts the analog temperature measurement signal output from the temperature detection unit 11 into a digital signal by the A / D conversion unit 19a and stores it in the storage unit 12b. Control to be stored is started, and all installed temperature measuring devices 8 start measurement and recording all at the same time from the same time. In that case, CPU12a performs control which memorize | stores the temperature measurement value by the temperature detection part 11 in the memory | storage part 12b for every preset time based on the time information by the timepiece part 12c.

  When a preset temperature measurement period (for example, 14 days) ends, each temperature measurement device 8 installed in the rainwater pipe is removed and collected, and a temperature record of each temperature measurement device 8 is transmitted to the control device 20 and stored therein. Store in the unit 24.

  In order to transmit the temperature history recorded in the collected temperature recording device 8 to the control device 20, first, a transmission command is issued from the input unit 26 of the control device 20 to the CPU 25, and the CPU 25 based on the command, the A / D conversion unit 28. The transmission request signal is transmitted as an electromagnetic wave to the temperature recording device 8 via the transmission / reception unit 22. In response to the transmission request signal received via the transmission / reception unit 13 and the A / D conversion unit 19a, the CPU 12a of the temperature recording device 8 determines the temperature history stored in the storage unit 12b and the installation location of the temperature recording device 8. Control is performed to transmit the information to be identified to the control device 20 as an electromagnetic wave.

  The CPU 25 of the control device 20 that has received the temperature history and information for specifying the installation location of the temperature recording device 8 performs control to store the temperature history in the storage unit 24 in association with the installation location. Further, the temperature history and installation locations of all the collected temperature recording devices 8 are sequentially stored in the storage unit 24 by a similar method.

  Next, the temperature history is compared by the control device 20, and the place where the sewage pipe is erroneously connected is specified. The specification includes a method in which the temperature history is output to the output unit 27 and a method in which the temperature history is output in accordance with an automatic detection program stored in the storage unit 24 in advance.

  In order to output the temperature history to the output unit 27, an output instruction is transmitted from the input unit 26 to the CPU 25, and the CPU 25 receives the command and performs control to output the temperature history from the storage unit 24 to the output unit 27. The temperature history output to the output unit 27 can be either analog display (recording) or digital display (recording).

  FIG. 8 shows an analog display of part of the temperature history in the rainwater pipeline stored in the storage unit 24 of the control device 20 by the output unit 27. In FIG. 8, for simplicity of explanation, only the temperature history of the temperature recording device 8 installed at the locations R1 to R4 in the rainwater pipe as the sewer pipe 1 shown in FIG.

  In general, rainwater (original running water) in the rainwater pipes flows only during rainfall and does not flow during fine weather. When running water due to rainwater is present in the rainwater pipeline, the rainwater temperature is recorded in the temperature recording device 8, and when there is no running water, the air temperature in the vicinity of the temperature recording device 8 in the pipeline is recorded. The There is a temperature difference between the rainwater temperature and the air temperature, and the running water temperature due to rainwater in the rainwater pipeline tends to be lower than the air temperature.

  On the other hand, the sewage temperature discharged from ordinary houses tends to be higher than the rainwater temperature, and the groundwater temperature tends to be lower than the sewage temperature.

  The period A in FIG. 8 is each temperature history including the air temperature t0 and the rainwater temperature (running water temperature) t1 in the rainwater pipeline before and after the rain in the area where the rainwater pipeline is laid. All the temperature histories at locations R1 to R4 have the same tendency, indicating that there was rainfall in the area.

  In FIG. 8, the rainwater temperature t1 is drawn as a straight line parallel to the time axis in the period A. Actually, the rainwater temperature t1 changes up and down in time series in a relatively narrow range due to various conditions in the pipeline. It becomes a belt shape. Therefore, in the present invention, this band-like relatively narrow temperature range is defined as the normal temperature range of rainwater (the normal temperature range of the original running water in the rainwater pipeline), and the median value is shown as t1 in FIG.

  If the normal temperature range of rainwater in FIG. 8 is unstable due to some reason, for example, when rain of unknown cause is temporarily mixed in the rainwater pipe during rainfall and an unstable temperature change is shown in FIG. The normal temperature range of rainwater can be determined with reference to the temperature history of the temperature recording device 8 installed in the rainwater mass M shown.

  In FIG. 1, the branch pipe 3 between the locations R1 and R4 is illustrated with a redundant connection location of the rainwater pipe 7 or a groundwater intrusion location (in reality, there are very few examples where they overlap, (For convenience, it is drawn in the same drawing.) However, the amount of rainwater is usually large during rainfall, because of intermittently entering sewage, cracks in pipes, or gaps formed in pipes at pipe connections. Since the flow rate of groundwater that enters may be small compared to the amount of rainwater, it is difficult to specify the location of intrusion of abnormal water such as sewage or groundwater during rainfall, as in period A in FIG.

  On the other hand, the period B in FIG. 8 is a fine day, and it appears that sewage enters the rainwater pipeline intermittently. In other words, the air temperature t0 in the rainwater pipe line continues at the locations R2 to R4, but the air temperature t0 and the temperature t2 higher than that appear only at the location R1. From this, it can be identified that the sewage pipe 7 is erroneously connected between the place R1 and the place R4 of the branch pipe 3 shown in FIG.

  The period C in FIG. 8 is also fine, and it is apparent that groundwater has entered the rainwater pipeline. In other words, the air temperature t0 in the rainwater pipeline continues at the locations R2 to R4, but the temperature t3 lower than the normal water temperature range in the rainwater pipeline appears only at the location R1. Since this period is a fine day, it can be specified that groundwater has entered between the locations R1 and R4 of the branch pipe 3 shown in FIG. In FIG. 8, groundwater intrusion occurs only in period C. This is an example in which the groundwater level rises to the cracked place of the pipeline and enters at this time. The rise time of this groundwater is often repeated periodically due to the influence of the season and rainfall, but by comparing the temperature history over a relatively long period (for example, about 2 to 3 weeks) at the time when the groundwater rises, The fact of groundwater intrusion becomes clear and the intrusion location can be identified.

  Next, a description will be given of a method for specifying the location of the intrusion of abnormal water using an automatic detection program stored in the storage unit 24 of the control device 20 in advance. In this embodiment, the laying information of the rainwater pipeline is stored in advance in the storage unit 24 of the control device 20 together with the automatic detection program, and the rain information including the rain start time and the rain end time of the area is stored before the start of the automatic specifying operation. By inputting from the input unit 26, the data is stored in the storage unit 24.

  When an automatic specification start instruction is transmitted from the input unit 26 to the CPU 25, the CPU 25 reads each temperature history stored in the storage unit 24 and sequentially scans for the presence or absence of the period B or period C shown in FIG. Go. If the condition of period B is extracted, the fact that the sewage pipe is misconnected to the rainwater pipe and its location are output from the output unit 27. If the condition of period C is extracted, the fact of the intrusion of groundwater and its location are output. Output to the output unit 27.

(Two-stage method)
Next, a two-stage system which is another embodiment will be described. Normally, the rainwater pipe is composed of a main pipe 2 and a plurality of branch pipes 3 branching from the main pipe 2 as shown in FIG. 1, but the place where the sewage pipe is erroneously connected is often the branch pipe 3. An erroneous connection of the sewage pipe is detected by the occurrence of a bad odor or a strange odor in the vicinity of the discharge section 5 at the end where the main pipe 2 is connected to a river or the like. It is efficient to go back to the upstream and then move to the branch pipe 3.

  In this embodiment, when specifying the location of the sewage pipe misconnection in the branch pipe 3, first, the temperature recording devices 8 are installed at a plurality of locations along the upstream side from the downstream side of the main pipe 2, and each temperature recording is performed. The apparatus 8 records the temperature in the main pipe 2 for a predetermined period. After the recording, the temperature recording devices 8 are collected from the respective installation locations, and then the temperature histories recorded in the collected temperature recording devices 8 are compared. The most upstream installation location where the temperature recording device 8 in which the temperature history different from the normal temperature range of the rainwater (original running water) in the main pipe 2 is recorded (in the case of the sewer pipe 1 shown in FIG. 1) The installation location of the second temperature recording device 8 from the most downstream discharge part 5 in the main pipe 2 toward the upstream side is specified.

  Next, the specified main pipe 2 or a branch pipe 3 connected to the nearest upstream side (in the case of the sewer pipe 1 shown in FIG. 1, the upstream side from the most downstream discharge section 5 in the main pipe 2 In the two branch pipes 3) connected to the left and right of the third manhole 6, the temperature recording devices 8 are newly installed at a plurality of locations along the upstream side from the downstream side. Then, in the same manner as the main pipe 2, abnormal water has infiltrated upstream from the place where the temperature recording device 8 where the temperature history different from the normal temperature range of rainwater in the branch pipe 3 is recorded is installed. Is specified. In the case of the two-stage method, the place where abnormal water has entered can be specified by the automatic detection program stored in the storage unit 24 of the control device 20 as in the case of the above-described stage method.

(When the sewer pipe is a sewage pipe)
When the sewer pipe 1 shown in FIG. 1 is a sewage pipe, the discharge part 5 of the main pipe 2 becomes a treatment facility in the sewage treatment plant. The amount of sewage flowing into the treatment facility from the sewage pipe is almost constant depending on the region. When connected, a large amount of rainwater flows into the treatment facility from the sewage pipeline during rainfall. Therefore, it can be seen from these increases in the amount of inflow water that erroneous connection of rainwater pipes and intrusion of groundwater has occurred, so the operation for specifying the location is started. Since operations such as installation and recovery of the temperature recording device 8 in the sewage pipe and identification of abnormal water intrusion by the control device 20 are the same as the operations in the rainwater pipe, overlapping description is omitted.

  FIG. 9 shows an analog display of a part of the temperature history in the sewage pipe line stored in the storage unit 24 of the control device 20 by the output unit 27. For simplification of description, FIG. 9 shows only the temperature history of the temperature recording device 8 installed at the locations R1 to R4 in the sewage pipeline as the sewer pipeline 1 shown in FIG.

  In general, the running water of the branch pipe 3 constituting the sewage pipe is intermittently discharged from many houses and offices, but tends to become a continuous flow by joining together. FIG. 9 shows the temperature history of the temperature recording device 8 installed at the locations R1 to R4 in FIG. 1, and the temperature history when there is no intrusion of abnormal water indicates the sewage temperature t2.

  In FIG. 9, the sewage temperature t2 when there is no intrusion of abnormal water is drawn as a straight line parallel to the time axis, but the difference between residential areas, commercial areas, industrial areas, etc. Although there are differences due to various condition changes such as differences, it is a band shape that changes in a time series up and down in a relatively narrow range. Therefore, in the present invention, this belt-like relatively narrow temperature range is defined as “normal temperature range of sewage”, and its median is shown as t2 in FIG. In addition, the normal temperature range of the rainwater and the normal temperature range of the sewage are defined as “the normal temperature range of the original flowing water” flowing through the sewer pipe in the present invention.

  The method for specifying the abnormal water intrusion location in the sewage pipe can be either a one-stage method or a two-stage method, as in the method for specifying the abnormal water intrusion location in the rainwater pipe, and automatic control by the control device 20 is also possible. Similar to the above. Since the operation of the rainwater pipeline and the sewage pipeline is basically the same as described above, only the method of specifying in a one-step system based on the temperature history output to the output unit 27 will be described here as a representative.

  In FIG. 9, during the period D, there is rainfall in the area, and the temperature history of the places R2 to R4 remains the sewage temperature (normal sewage temperature range) t2, but the temperature history of the place R1 drops from t2 to t1. Yes. In other words, the amount of rainwater flowing through the sewage pipeline during rainfall is much larger than the amount of sewage, and when the rainfall time passes and the amount of rainwater inflow increases, the running water temperature in the sewage pipeline is almost the rainwater temperature (normal rainwater temperature range) t1. A value close to. From these things, it can be specified that the rainwater pipe is misconnected between the locations R1 and R4 of the branch pipe 3. In addition, rainwater temperature t1 (normal temperature range of rainwater) is unstable for some reason, for example, rainwater flowing into a sewage pipe during rain causes unknown water to be mixed and unstable temperature changes. In such a case, the fact of the intrusion of rainwater can be specified with reference to the temperature history of the temperature recording device 8 installed in the rainwater mass M shown in FIG.

  In FIG. 9, the period E is in fine weather, and the temperature history of the places R2 to R4 remains the sewage temperature (normal sewage temperature range) t2, but the temperature history of the place R1 is considerably lowered to t3. Since it is a fine day, there is no rainfall, and from this, it is possible to specify the presence of a groundwater infiltration place between the locations R1 and R4 of the branch pipe 3.

  The method for specifying an abnormal water intrusion place in a sewer pipe of the present invention can be used for specifying an abnormal water intrusion place generated in a sewer pipe such as a rainwater pipe or a sewage pipe constituted by a main pipe and a branch pipe.

M rainwater mass R1 to R4 place 1 sewer pipe 2 main pipe 3 branch pipe 4 opening 5 discharge part 6 manhole 6a peripheral wall 6b bottom face 6c invert 7 different pipe rod 7a intrusion place 8 temperature measuring device 8a chain 8b fixing part 8c fixing tool 10 Power supply unit 11 Temperature detection unit 12 Recording unit 12a CPU
12b Storage unit 12c Clock unit 13 Transmission / reception unit 13a Transmission / reception circuit 13b Antenna 14 Sealed container 15 Main body 15a Cover 16 Fixture 17 Wall 18 Screw type anchor bolt 19a, 19b A / D conversion unit 20 Controller 21 Power supply unit 22 Transmission / reception unit 22a Transmission / reception circuit 22b Antenna 23 Control unit 24 Storage unit 25 CPU
26 Input unit 27 Output unit 28 A / D conversion unit

Claims (7)

  In a method for identifying the location of abnormal water intrusion in a sewer pipe, temperature recording devices that record the temperature in the sewer pipe at predetermined intervals are provided at a plurality of locations along the upstream side from the downstream side of the sewer pipe. Each temperature recording device is installed and the temperature in the sewer pipe is recorded for a predetermined period by each temperature recording device. After the recording, each temperature recording device is collected from each installation location, and then recorded in each collected temperature recording device. Compare temperature histories and identify abnormal water intrusion upstream from the location where the temperature recording device that records temperature histories different from the normal temperature range of the original running water in the sewer pipe is installed A method for identifying the location of abnormal water intrusion in sewer pipes.   2. The sewer pipe according to claim 1, wherein a sewer and a plurality of manholes arranged in a distributed manner from the downstream side to the upstream side of the sewer are laid, and a flow path crossing the manhole or the vicinity of the manhole connection portion of the sewer A method for identifying an abnormal water intrusion place in a sewer pipe, characterized in that a temperature recording device is installed at the bottom. In Claim 1 or Claim 2, the sewer of the sewer pipe is composed of a main pipe and a branch pipe,
First, the temperature recording devices are installed at a plurality of locations along the upstream side from the downstream side of the main pipe, and the temperature inside the main pipe is recorded for a predetermined period by each temperature recording device. The temperature recording device installed on the most upstream side where the temperature history recorded in each temperature recording device is compared and the temperature history different from the normal temperature range of the original flowing water in the main pipe is recorded. Identify the location of
Next, the temperature recording device is installed at a plurality of locations along the upstream side from the downstream side of the main pipe at the installation location of the specified temperature recording device or the branch pipe connected to the immediate upstream side, and the same as the main pipe A sewer system characterized in that abnormal water is intruded upstream from a place where a temperature recording device in which a temperature history different from the normal temperature range of the original flowing water in the branch pipe is recorded by a simple method. How to identify the location of abnormal water intrusion in the pipeline   In any one of Claim 1 thru | or 3, when a sewer pipe is a rainwater pipe, abnormal water is the sewage which penetrate | invaded by the misconnection of the sewage pipe | tube, or the groundwater which penetrate | invaded from the gap | interval produced | generated to the pipe line, or the damaged part. A method for identifying an abnormal water intrusion place in a sewer pipe, characterized by being.   In any one of Claim 1 thru | or 3, when a sewer pipe is a sewage pipe, abnormal water is the rainwater which penetrate | invaded by the misconnection of the rainwater pipe, or the groundwater which penetrate | invaded from the gap | interval produced | generated or the damaged part in the pipe A method for identifying an abnormal water intrusion place in a sewer pipe, characterized by being.   6. A rainwater pipe laid in an area where the location of abnormal water intrusion is specified, according to claim 1, wherein rainwater flows from a road through a side groove into a rainwater mass, and further comprises the rainwater pipe If a temperature recording device is installed in the rainwater mass, the rainwater temperature falling in the area is recorded for a predetermined period, and the temperature recording device is recovered from the installation location after the recording is completed. Then, a method for identifying an abnormal water intrusion place in a sewer pipe, characterized in that the temperature history recorded in the collected temperature recording device is used as the normal temperature range of rainwater for the identification. 7. The temperature measuring apparatus according to claim 1, wherein the temperature measuring device includes a power supply unit, a temperature detecting unit, a recording unit that records a temperature measurement value by the temperature detecting unit every preset time, and a control for specifying the temperature measuring unit. A transmission / reception unit that performs electromagnetic wave communication with the device,
The control device includes a control unit, a storage unit, an output unit, and a transmission / reception unit that performs electromagnetic wave communication with each temperature measurement device, and the control unit transmits an electromagnetic wave requesting transmission to each temperature recording device via the transmission / reception unit. And control to store the temperature history received from each temperature recording device via the transmission / reception unit in the storage unit, and the control unit performs control to output the temperature history stored in the storage unit to the output unit. A method for identifying an abnormal water intrusion place in a sewer pipe, characterized in that it is performed.

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