JP4021098B2 - Method for determining the range of water leakage into the gas conduit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for specifying a leaked water inflow range to a gas conduit for narrowing a range in which the leaked water is stored when leaked water enters a gas conduit for supplying a gas such as city gas.
[0002]
[Prior art]
In order to supply gas such as city gas to a wide range of customers, gas conduits are buried in the ground to form a conduit network. There is underground water in the ground, or a water pipe for supplying tap water to customers in the same range.
[0003]
FIG. 3 shows a state in which a water pipe 3 is present in the vicinity of the gas conduit 2 buried below the ground surface 1. It is assumed that water leaks in the water pipe 3 for some reason, and water spouts out to the gas conduit 2 side. If water is simply ejected from the water pipe 3, water does not enter the gas conduit 2, and there is no problem of water leakage. However, when sand in the ground hits the outer periphery of the gas conduit 2 together with the water ejected from the water pipe 3, the outer periphery of the gas conduit 2 is scraped off by a sandblast phenomenon. When such a state continues, an opening is formed on the outer periphery of the gas conduit 2, and moisture enters the gas conduit. In the unlikely event that water leaks into the gas conduit 2, the cross-sectional area through which the gas in the gas conduit 2 flows is narrowed depending on the amount of the water leakage, which hinders gas supply. In such a case, it is necessary to specify the position where water leaks and the range in which water has accumulated as soon as possible, and to discharge the water in the gas conduit 2.
[0004]
Regarding the location where water leaks in the gas conduit 2, it has been confirmed whether there is any obstacle to the supply to the customers who have been supplied with city gas, and the location of the customers who are affected is plotted on the map. Then, the range is specified and the inflow range of the leaked water is estimated.
[0005]
[Problems to be solved by the invention]
When identifying the location where water leakage has occurred by collecting information from each customer that there is a problem with supply, it takes a lot of people and time, and the number of targeted customers should be small. In this case, the accuracy of specifying the leaked-in place is deteriorated, and it takes time to discharge the water accumulated in the gas conduit 2.
[0006]
An object of the present invention is to provide a method for specifying a water leakage inflow range into a gas conduit that can quickly and accurately specify a range in which water leakage is accumulated in the gas conduit.
[0007]
[Means for Solving the Problems]
The present invention is a gas meter that measures the amount of gas supplied to a customer by an information center, makes it possible to detect changes in humidity in the gas, collects information about changes in humidity from multiple gas meters, and increases humidity. to have estimated the range of conduit network that supplies gas to the gas meter, to create a three-dimensional piping diagram, within the scope of the estimated pipeline network, the range of conduit network is provided in a lower position, wherein A low water inflow range to a gas conduit is characterized in that a low position of a pipe network is obtained from a three-dimensional piping diagram and specified as a water leak inflow range.
[0008]
According to the present invention, a customer who receives gas supply from a gas conduit network composed of gas conduits is provided with a gas meter for measuring the supply amount, and the gas meter can detect a change in humidity in the gas. When collecting information about humidity changes from multiple gas meters, the range of the associated conduit network is deduced from the range of gas conduits supplying gas to the gas meter with increasing humidity. Of the estimated conduit network, it can be estimated that water tends to accumulate particularly in a range where the conduit network is provided at a low position. Since the range specified in this way is the leaked water inflow range, the range in which leaked water can be quickly and accurately specified.
[0009]
In the present invention, the gas meter has a function of transmitting measurement data for automatic meter reading,
The collection of the information is performed at any time when an abnormality is detected from any gas meter.
[0010]
According to the present invention, the gas meter has a function of transmitting measurement data for automatic meter reading, and if any gas meter detects an abnormality, information on humidity change is collected at any time, so that the amount of intrusion of water leakage increases. Therefore, before the gas supply is hindered, it is possible to detect the intrusion of water leakage, identify the intrusion range of the water leakage, and take appropriate measures.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a concept of specifying a water leakage intrusion range according to an embodiment of the present invention. As shown in FIG. 1A, information from customers who receive city gas supply is automatically collected at the information center 10. In order to collect information from customers at the information center 10, each customer is provided with microcomputer meters 11, 12, 13,..., Which are gas meters with a built-in microcomputer and an automatic meter reading function. The microcomputer meters 11, 12, 13,... Not only measure the supply amount of city gas, but also include a humidity sensor or the like to detect moisture contained in the city gas. The pressure can also be detected. The automatic meter reading for the microcomputer meters 11, 12, 13,... Is periodically performed, for example, every month, and measurement data is transmitted to the information center 10 according to a request from the information center 10. When there is a problem in the supply of city gas to a certain customer, the information center 10 is notified as needed. The information center 10 collects information on detected values of pressure and humidity for the microcomputer meters 11, 12, 13,... Provided in the customer and the surrounding customers. In general, there is a humidity increase range 21 in which the humidity increases in a range wider than the supply failure range 20 in which supply failure actually occurs. There is a possibility that water leaks have entered the conduit network embedded in the humidity increase range 21. Information is collected by wireless or wired data communication.
[0012]
FIG. 1B shows the relationship between the buried position of the gas conduit 22 and the place where the water leakage 23 is accumulated. The gas conduit 22 is generally embedded from the ground surface 24 to a certain embedded depth GL. The embedding depth GL is about 1.5 m. Therefore, it becomes relatively low at a position where the altitude DL of the ground surface 24 is low, and the water leakage 23 tends to accumulate.
[0013]
FIG.1 (c) shows the state which overlap | superposed the low altitude position as shown in FIG.1 (b) with respect to the humidity increase range 21 of Fig.1 (a). The overlapping range of the humidity increase range 21 and the low range 25 which is a low altitude position can be specified as the water leakage inflow range 26. If the water leakage inflow range 26 is specified, the gas conduit 22 is exposed by excavating the specified water leakage inflow range from the ground surface 24, and the cause of the leakage is directly searched for, or the gas conduit 22 is removed. It is possible to remove the water accumulated in the inside and remove the obstacle of gas supply.
[0014]
FIG. 2 shows a procedure in which the information center 10 applies the present invention to accurately specify the water leakage inflow range. The procedure starts from step s1, and in step s2, automatic meter reading is performed to collect information on the gas supply amount from the microcomputer meters 11, 12, 13,. In step s3, it is determined whether or not there is a microcomputer meter 11, 12, 13,... From which an abnormal increase in humidity is detected. When it is determined that there are microcomputer meters 11, 12, 13,..., In which an increase in humidity is detected, in step s4, microcomputer meters 11, 12, 13,. The humidity increase range 21 is specified based on the distribution of the humidity measurement data of the surrounding microcomputer meter. Next, in step s5, the low range 25, which is the range where the position of the ground surface 24 is low, is specified within the humidity increase range 21. In step s6, the overlapping range of the low range 25 and the humidity increase range 21, that is, the low range 25 within the humidity increase range 21 is specified as the water leakage inflow range 26. In step s7, water leakage countermeasures such as eliminating accumulated water leakage are performed on the water leakage inflow range 26 specified in step s6. After the water leakage countermeasure at step s7 is completed, or when it is determined that there is no abnormal increase in humidity at step s3, one processing procedure is terminated at step s8.
[0015]
As shown in FIG. 2, if information on other humidity changes is also collected at the time of detecting a humidity abnormality in step s3, the location of the leaked water inflow can be quickly identified using the function of the automatic meter reading system. This can be performed reliably, and appropriate measures can be taken before the gas supply is actually disturbed.
[0016]
Even if it does not have an automatic meter reading function, if each gas meter has a function to detect and display humidity changes, it can also determine whether there is a humidity change at the time of gas meter reading. Even if it is not done, the humidity increase range 21 can be easily specified.
[0017]
The determination of the low range 25 as shown in FIG. 1B can also be made by creating a three-dimensional piping diagram and determining the low position of the conduit network therefrom. A three-dimensional piping diagram can be created by superimposing the plane piping diagram of the gas conduit network and the elevation, and the low position of the conduit network is determined from the three-dimensional piping diagram, and the infiltrated water is collected in which side. It can be confirmed whether it is easy. By combining these pieces of information, it is possible to quickly and accurately specify the area where the infiltrated water has accumulated.
[0018]
In the above description, the case where water leaks into the gas conduit in the ground and the water has accumulated is explained, but the water has entered the supply pipe that has come out on the ground surface for some reason and is in a low position. The present invention can be similarly applied to a case where water flows into the conduit network and hinders gas supply. That is, although the water intrusion position is not necessarily a low position, the water accumulation position is a low position, so the range where water that has accumulated in the gas conduit and hinders gas supply is accumulated. The gas can be identified and removed quickly to facilitate the gas supply.
[0019]
【The invention's effect】
As described above, according to the present invention, based on the humidity change detected by the gas meter, it is estimated that the water leaks in when the humidity increases, and the water leaks occur based on the installation positions of the plurality of gas meters that detect the humidity increase. The area of the pipeline network that may be present is estimated, and the area where the position of the pipeline network is low is identified as the leakage inflow area, so that it can be identified quickly and easily, and appropriate measures against leakage intrusion can be quickly performed. It can be carried out.
[0020]
In addition, according to the present invention, the gas meter has an automatic meter reading function. When an abnormality occurs, the automatic meter reading function is used to collect information on changes in humidity at any time, and the influence of water leakage intrudes the gas supply. Before starting, it is possible to quickly and accurately identify the water leakage intrusion range.
[Brief description of the drawings]
FIG. 1 is a diagram showing a concept for specifying a water leakage inflow range into a gas conduit in an embodiment of the present invention.
FIG. 2 is a flowchart showing a procedure for specifying a water leakage inflow range as shown in FIG.
FIG. 3 is a simplified cross-sectional view showing a state where water leakage from a water pipe 3 enters a gas conduit 2 buried in the ground.
[Explanation of symbols]
10 Information center 11, 12, 13, ... Micrometer 20 Supply hindrance range 21 Humidity increase range 22 Gas conduit 23 Water leakage 24 Ground surface 25 Low range 26 Water leakage inflow range

Claims (2)

A gas meter whose information center measures the amount of gas supplied to customers. It enables detection of changes in humidity in the gas, collects information about changes in humidity from multiple gas meters, and the humidity is increasing. Estimate the range of the conduit network supplying gas to the pipe, create a three-dimensional piping diagram , and set the range of the estimated conduit network in the lower position of the conduit network to the three-dimensional piping A method for specifying a water leakage inflow range into a gas conduit, wherein a low position of the conduit network is obtained from the figure and specified as a water leakage inflow range.   The said gas meter is equipped with the function which transmits measurement data for automatic meter-reading, The collection of the said information is performed at any time at the time of abnormality detection from any gas meter, The leakage inflow range to the gas conduit of Claim 1 characterized by the above-mentioned Identification method.

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