JP2001329576A - Water pressure estimating system for pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationally constitute a system capable of easily estimating the water supply stop damage of a pipeline by an earthquake. SOLUTION: A general purpose computer 3 estimates the damaged pipeline based on the pipeline information and earthquake information, determines a water leakage quantity from the water pressure of the damaged pipeline, performs a process for determining the water pressure of the damaged pipeline from the water leakage quantity until the water leakage quantity and the water pressure are converged, and outputs a water supply stop population and a water supply stop factor to a display 1 and a printer 6 by comparing the determined water pressure with the predetermined water pressure value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for estimating water pressure in a pipeline, and more particularly to a technique for processing earthquake damage to a water supply pipeline.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 9-259186 discloses a technique similar to the technique for dealing with earthquake damage to a water supply pipe network. Equipped with a pressure gauge to measure and a flow meter to measure the flow rate in the pipeline, and after an earthquake, at least one of ground acceleration data from the seismometer, pressure data from the pressure gauge, and flow data from the flow meter By taking it into the server, estimating the pipeline damage rate for each regional mesh, calculating the number of damaged pipelines from this estimation result, and assigning only the number of damaged pipelines from the pipeline with the highest break priority,
Processing to determine the location of the leak and the amount of the leak is performed, and restoration work can be performed based on this.

[0003]

SUMMARY OF THE INVENTION The prior art is intended to make it possible to immediately judge the degree of damage after an earthquake and to make a plan for restoration work. Although it is important to judge damage after an earthquake in this way, it is also important to promote seismic resistance of pipelines. Also, considering construction for earthquake resistance, many pipelines are buried under the road even if construction for earthquake resistance is considered. It is necessary to take measures such as carrying out construction work, and the construction for earthquake resistance requires replacing the buried pipeline, which not only requires a large amount of cost for the construction but also It will take some time. Therefore, it is not realistic to try to make many pipelines earthquake resistant in a short period of time. Considering this fact, it is considered ideal to minimize the damage in the event of an earthquake by making the pipelines as seismic resistant as possible. However, the technology for grasping the damage at the time of the earthquake, that is, the water interruption area and the water interruption rate has not been established, and it has been difficult to appropriately select a pipeline to be made earthquake-resistant.

An object of the present invention is to rationally construct a system that can estimate the damage to a pipeline caused by an earthquake and easily select a pipeline that minimizes earthquake damage based on the estimation.

[0005]

A first feature of the present invention (claim 1) is to perform a damage estimation process for estimating a damaged pipeline from an earthquake simulation on a pipe network, and to perform damage estimation by the damage estimation process. Estimate the amount of water leakage in the pipeline, perform water pressure estimation processing to obtain the water pressure of the damaged pipeline based on this amount of water leakage, compare the water pressure obtained in this water pressure estimation processing with the set water pressure, and output the comparison result There is a processing device for outputting to the device, and its operation and effect are as follows.

According to a second feature of the present invention (claim 2), in the claim 1, the damage estimation processing includes dividing the pipe network into a plurality of areas, and determining a damage rate based on an acceleration of a seismic motion in each area. And a process of estimating the damaged pipeline based on the damage rate and the random number. The operation and effect are as follows.

[0007] A third feature of the present invention (claim 3) is that, in claim 1 or 2, the processing device is made seismic-resistant for a selected one of the damaged pipelines estimated in the damage estimation processing. It is configured to perform a process of replacing the pipe network assuming that the pipe network is used, and its operation and effect are as follows.

A fourth feature of the present invention (claim 4) is that, in any one of claims 1 to 3, wherein the water pressure estimating process is:
It is configured to include a water leak amount calculation process for obtaining a water leak amount based on the provisional water pressure set in the damaged pipeline, and a water pressure calculation process for obtaining the water pressure of the damaged pipeline based on the leak water amount and setting the temporary water pressure. At the same time, the provisional water pressure is obtained by the water pressure calculation process from the water leakage amount obtained in the water leakage amount calculation process, and the process of returning the provisional water pressure to the water leakage amount calculation process is repeatedly performed. When a predetermined equilibrium state is reached, the provisional water pressure in the equilibrium state, or the processing form is set to set the pipeline water pressure determined from this temporary water pressure to the water pressure of the pipeline. , Its operation and effect are as follows.

A fifth feature of the present invention (claim 5) is that, in any one of claims 1 to 4, a plurality of pipeline installation information stored in a storage means is combined and used as the pipe network. The operation and effects are as follows.

[Action]

According to the first feature, a damaged pipeline caused by an earthquake is determined by a damage estimation process, a water leak amount in the damaged pipeline is estimated by a water pressure estimation process, and a water pressure of the damaged pipeline is estimated from the water leak amount. The processing device causes the output device to output the result of the comparison between the determined water pressure and the set water pressure, and the operator can grasp the outline of the damage to the pipe network based on the output result of the output device. Becomes
In other words, this system compares the water pressure determined by water leakage from the damaged pipeline with the set water pressure. Gain.

According to the second feature, since the damage probability is obtained based on the acceleration of the seismic motion for each area obtained by processing such as partitioning the pipe network by meshes, the damage probability in the entire pipe network is obtained. Compared to those, the accuracy of the damage probability increases, and the damage pipeline in each area is estimated based on the damage probability and the random number, so that the damage pipeline can be rationally estimated based on the theory of probability. Becomes

According to the third feature, the selected pipeline among the damaged pipelines estimated in the damage estimation processing is assumed to have been earthquake-resistant, and the pipe network is replaced to perform processing for replacing the pipe network. This makes it possible to compare the state where the quake is not earthquake-resistant with the state where the quake is not earthquake-resistant. In other words, it is possible to easily determine whether the selection of the damaged pipeline to be made earthquake-resistant is appropriate.

According to the fourth feature, the water pressure estimating process determines the amount of water leakage in the damaged pipeline by the leak amount calculating process, and determines the water pressure of the damaged pipeline based on the amount of leaked water by the hydraulic pressure calculating means. Since the convergence is achieved by performing the processing repeatedly (repeatedly), the accuracy of the obtained water pressure is high.

According to the fifth feature, since a plurality of pipeline installation information stored in the storage means are combined and used, the trouble of inputting information of a pipeline network which tends to be large-scale can be omitted. It is also possible to determine the pipe position, pipe diameter and pipe length obtained from the existing pipe installation information and perform the processing.

[Effects of the Invention] Therefore, a system which can easily estimate the damage caused by the earthquake due to water interruption has been rationally constructed. In addition, by accurately estimating damage to pipelines due to earthquakes, it is possible to compare damage before and after seismic resistance, thereby facilitating the selection of pipelines that minimize earthquake damage. The value of the water pressure due to water leakage in the pipeline is determined with high accuracy, and these processes are facilitated based on existing pipeline information.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a pipe network having a display 1 composed of a CRT or a liquid crystal display device as an output device and a general-purpose computer 3 as a processing device having a built-in hard disk 2 as a storage means is provided. A damage evaluation system is configured. As shown in FIG. 1, the general-purpose computer 3 is provided with a keyboard 4 for data input and a mouse 5 as pointing means. The general-purpose computer 3 is connected to a printer 6 as an output device.

As shown in FIG. 2, this system damages the existing pipe network PN to which water from the water source S is supplied and the damage estimated from the earthquake in the pipe network assuming earthquake resistance. And a program for performing a process of outputting to the display 1 and the printer 6 is set. As shown in FIG. 3, an outline of the process is as follows. In the first estimation process (#A), an earthquake simulation is performed on the existing pipe network PN, and the damaged pipeline estimated by the simulation is already displayed on the display 1. In addition to performing the process of displaying in the pipe network, the population of water interruption or the water interruption rate is estimated in the damage estimation process (#B) based on the damaged pipeline, and the process of displaying the estimation result on the display 1 is performed. In addition, a process for assuming earthquake resistance is performed according to a priority set in advance in the anti-seismic assumption process (#C) from the estimated damaged pipeline, and is further assumed in the anti-seismic assumption process (#C). A process of displaying the assumed result in the pipe network of the display 1 is performed. Next, in the earthquake resistance cost calculation processing (#C ′), the earthquake resistance assumption processing (#
In C), the construction cost required for laying a pipeline that assumes earthquake resistance is calculated, and a second estimation process (#D)
As described above, an earthquake simulation is performed on the pipe network in a state where earthquake resistance is assumed, and the damaged pipe estimated by the simulation is displayed in the pipe network of the display 1, and the damage estimation processing is performed based on the damaged pipe. (#
In E), the population of water interruption or the water interruption rate is estimated, and the estimation result is displayed on the display 1. Next, these #B
The result of the #E estimation process is compared for damage in a comparison process (#F), and the comparison result is output to the display 1 and the printer 6 in an output process (#G).

In this process, a first estimation process (#
A), damage estimation processing (#B), earthquake resistance assumption processing (#C)
FIG. 4 shows only the flow of information used when each processing is performed. That is, an earthquake simulation is executed based on the pipeline information constituting the pipeline PN, correction information described later, and predetermined earthquake information to determine the damage rate (Rm) of each pipeline constituting the pipeline PN. The damage probability (Pf) of each pipeline is estimated based on the damage rate (Rm) of each pipeline and the pipeline length information, and the damage probability (Pf) of each pipeline estimated in this way, a random number, The damage pipeline is estimated on the basis of the above. The above processing is an outline of the first estimation processing (#A), and the damage estimation processing (##) is performed based on the information on the damaged pipeline estimated in this way and the hydraulic analysis information.
B) In other words, the population of water interruption and the water interruption rate are obtained, and the anti-seismic assumption processing (#C) is performed based on the information on the damaged pipeline estimated in this way and the information on the weight value (K). These processes will be described below.

As shown in the flowchart of FIG. 5, the first estimating process (#A) is a process of setting pipe information and correction information constituting the pipe network PN, and performing pipe setting based on earthquake information. The damage rate (Rm) is estimated, and this pipe damage rate (Rm)
The pipeline damage probability (Pf) is estimated from
f) and the random number are used to estimate the damaged pipeline, and store the identification information of the estimated damaged pipeline and the estimated pipeline in a memory or the like (# 10).
1 to 105 steps).

Specifically, in step # 101, the pipe network PN
Are divided into meshes at predetermined intervals as shown in FIG.
A process for setting the pipeline information in each of the regions Z partitioned in a mesh shape and a process for setting the correction information for the pipeline in each of the regions Z are performed. Here, the structure of the pipeline information file Fa for storing the pipeline information will be described. As shown in FIG. 2, the area where the pipe network PN exists is divided into a plurality of areas Ar and corresponds to each area Ar. The pipeline information file Fa is stored in the hard disk 2. The pipeline information file Fa (an example of pipeline installation information) stored in the hard disk 2 includes a [header] and an [information area] as shown in FIG.
Creation date, update date, data amount, offset position information indicating the position of area Ar, etc. are stored, and [information area] stores pipeline information, valve / plug information, and geographic information. , Pipe line information, Pipe end position, Bend position, Pipe type, Pipe diameter, Pipe length, Installation date, Burial depth, Flow rate (Water volume), Deterioration, Average pressure change, Population subject to pressure reduction, Flow rate ratio And other information, such as valve and plug information, including the location and type of valves and plugs, and geographical information, including information on topography, road locations, and building locations, and earthquake information. It contains information such as seismic intensity, seismic maximum acceleration, and liquefaction risk. Then, in this system, as shown in FIG. 18, in a state where the pipelines are connected by a process such as coordinate conversion of the location of the pipeline information of each pipeline information file Fa, as shown in FIG.
A process of displaying a pipe network PN in the window W1 of the display 1 is performed (the processing mode is not described in detail). If necessary, the window W2 is separately opened to display an enlarged pipeline. Information on the pipeline selected from the pipeline PN, that is, information on the pipe diameter, pipe length, installation date, etc., is read from the pipeline information file Fa, and a process of displaying the information at a position near the pipeline can be performed. I have.

As shown in FIGS. 8 to 11, the correction information includes a "correction coefficient for pipe type" Cp, a "correction coefficient for pipe diameter" Cd, and a "correction coefficient for terrain / ground" C
g, and a "correction coefficient for liquefaction" Cl.
These correction factors are given to each pipeline when simulating an earthquake. Also, earthquake information refers to pipe network PN
Of the hypocenters that have an active fault or the like that affects the area where the earthquake exists, the hypocenter is assumed in advance and includes data of an assumed scale (held by a local government or the like).

In step # 102, a process of estimating a pipeline damage rate (Rm) for each mesh-shaped area Z based on the earthquake information is performed. The above-mentioned data is used for this earthquake information, and the equation published by the Japan Water Works Association is used to estimate the pipeline damage rate (Rm),
The formula is as follows.

Rm (α) = Cp × Cd × Cg × Cl × R (α), Rm (α): Damage rate when the maximum acceleration of earthquake motion is α, Cp: Correction coefficient for pipe type, Cd: Correction for pipe diameter Coefficient, Cg: Correction coefficient for terrain / ground, Cl: Correction coefficient for liquefaction, α: Maximum acceleration of earthquake motion ([gal] or [cm / sec]
2]),

In the process of step # 102, the pipe network P
Pipeline damage rate (Rm) for all pipes constituting N
Therefore, a process of giving a pipe type and a pipe diameter to all the pipes constituting the pipe network PN based on the information of the pipe information file Fa is performed. Calculation processing is performed based on a correction coefficient (Cg) relating to the terrain / ground, a correction coefficient (Cl) relating to liquefaction, and a maximum acceleration (α) of the seismic motion. The correction coefficient (Cg) relating to the terrain and the ground and the correction coefficient (Cl) relating to liquefaction can be stored in the pipeline information file Fa. In order to prevent the information from increasing, a layer that manages such information for each region is used, and this layer is superimposed on the region where the pipe network PN exists, and a process of giving the information set in the layer to each of the superimposed pipelines is performed. It is effective to set the processing mode to perform. For the maximum acceleration (α) of the seismic motion, set information corresponding to the area for the layer,
The processing mode is set so that the information set in this layer is superimposed on the existing pipe network PN to give seismic motion information to each of the pipelines.

In step # 103, a process of estimating the pipe damage probability (Pf) from the pipe damage rates (Rm) estimated for all the pipes and the pipe length information (L) (pipe length) is performed. . The pipeline damage probability (Pf) is given by the following equation.

Pf = 1−EXP (−Rm × L), L: length of pipeline,

In step # 104, the damaged pipeline is estimated from the pipeline damage probability (Pf) obtained as described above based on a random number and a probability theory. The damaged pipeline is a pipeline that generates water leakage, and is specifically determined by comparing the pipeline damage probability (Pf) set for each pipeline with the random number generated by the system. The pipeline damage probability (P
If the value of the random number is smaller than the value of f), it is estimated that the damage is caused, and if the value of the random number is larger than the value of the pipeline damage probability (Pf), it is estimated that the damage is not caused. The estimation is repeated about 100 times, and if it is determined that even one damage has occurred, it is estimated that the damage will occur.

In step # 105, processing for storing the identification information of the damaged pipeline (damaged pipeline) estimated to be damaged in a memory or the like is performed.

In the damage estimation process (#B), the amount of water leakage is determined for all damaged pipelines, the amount of leakage of each pipeline is analyzed, and the area where water is cut off from the pressure drop due to the leakage is determined. In the process, as shown in the flowchart of FIG. 12, identification information is set to identify each of the damaged pipelines stored in the step # 105 (step # 201), and the subsequent hydraulic analysis is performed. In the initial setting, the take-out amount (Wo) of the water leakage pipe is set to the provisional water amount (Wt), and the water pressure (Ho) of the water leakage pipe is set to the provisional water pressure (Ht) (Step # 202). Next, this temporary water pressure (H
The amount of water leakage (Rt) is calculated from t) (Step # 203). For this calculation, an equation indicating that the water pressure and the amount of water leakage are in a 1.15 power relation as shown in FIG. 13 is used (FIG. 13 shows the relation between the water pressure and the amount of water leakage of a pipe having a diameter of 200 mm). It is shown).

Next, the amount of water leakage (Rt) is added to the amount of pipe removal (Wo), and the result (Wt) is used to calculate the pipe water pressure (Hp).
t) (Step # 204), and the provisional hydraulic pressure (H
t) and the average value of the pipeline water pressure (Hpt) are set to the provisional water pressure (Ht) (Step # 205), and the absolute value of the provisional water pressure (Ht) and the pipeline water pressure (Hpt) is set to a preset threshold value. The processes of steps # 203 to # 205 are repeated (repeated) until the pressure becomes smaller, and the provisional water pressure (Ht) and the pipeline water pressure (Hp)
When the absolute value of t) becomes smaller than a preset threshold value (when it converges), the repetition of the processing is finished, and the pipeline water pressure (Hpt) or the water pressure of the pipeline connected to the pipeline, Is compared with the water cutoff pressure to discriminate the pipes that are in the water cutoff state from the pipes that can be supplied with water, display the information indicating the water cutoff area on the display 1, and store the information in the memory. (Steps # 206 to # 208).
When the processes of steps # 203 to # 205 described above are repeated, as shown in the graph of FIG. 14, the provisional water pressure (Ht), the water leakage amount (Rt), and the pipeline water pressure (Hpt. Is described as water pressure), and the provisional water pressure (Ht), the amount of water leakage (Rt), and the pipeline water pressure (Hpt) are obtained by repeated processing.
Converges, and as a result, can be given as water pressure in the pipeline.

In the anti-seismic assumption process (#C), as shown in the flowchart of FIG. 15, the weight values K1 to K6 (collectively referred to as weight values K) are tabulated based on the information on the damaged pipeline and the weight information. Then, the results of summing (integrating) the weight values K1 to K6 are compared with each other, and the priority is displayed on the display 1 as the priority order of the pipeline to be earthquake-resistant from the pipe having the largest sum value. Pipes with value K or more, or
Based on the set number of pipelines, the pipeline to be earthquake-resistant is assumed to be displayed on the display 1, and furthermore, processing for storing information on the pipelines thus assumed in a memory is performed (#). 301 to 303 steps). When performing the process of automatically setting the pipeline to be earthquake-resistant as in this process, the pipeline to be earthquake-resistant is displayed in accordance with the priority order based on the weight value K, and displayed in this manner. The operator can select an arbitrary number of pipelines to be made seismic-resistant from the top, and the operator inputs a weight value as a threshold to be made earthquake-resistant from those displayed, and the value of a value larger than this threshold can be obtained. It is also possible to set and implement a processing mode so as to select a pipeline to be subjected to earthquake resistance for a weight value.

The weight value is set for each pipeline based on the processing of FIG. Specifically, the damage rate (Rm) of the pipeline, the aging degree (Y) of the pipeline, the laying position of the pipeline (SP), the water supply point (DP), the flow ratio of the pipeline (Wq) , A weight value is given corresponding to the average pressure change amount (Ap) of the pipeline and the population to be reduced (Lp), and the damage factor (Rm) is the correction coefficient (α1) of the pipeline. Is multiplied by the damage rate (Rm) and the weight value (K
1), for the aging degree (Y), the result of multiplying the aging degree (Y) by the correction coefficient (α2) of the pipeline is given as a weight value (K2), and for the installation position (SP),
The result of multiplying the correction coefficient (α3) of the pipeline by the importance score (N) is given as a weight value (K3), and the water supply point (DP)
, The result of multiplying the correction coefficient (α4) of the pipeline from the water source S to the water supply point DP by the importance score (N) is given as a weight value (K4), and the flow rate ratio (Wq) is The result of multiplying the correction coefficient (α5) by the importance score (N) is given as a weight value (K5), and the average pressure change amount (A
For p), the result of multiplying the correction coefficient (α6) of the pipeline by the importance score (N) is given as a weight value (K6), and for the low pressure target population (Lp), the correction of the pipeline A process of multiplying the coefficient (α7) by the importance score (N) as a weight value (K7) is performed in advance.

In the damage rate (Rm), a pipe with a higher damage rate (Rm) has a larger weight value (K1).
In the aging degree (Y), the weight value (K
2) is to be increased, and a large value of importance score (N) is set for those laid on an emergency road where restoration work cannot be performed immediately at the laying position (SP), and the water supply point (DP) For the pipelines that supply water to the pipelines, the pipelines that supply water to the water supply point (DP) of hospitals or public facilities where residents are evacuated in the event of a disaster are extracted, and the higher the importance set by the operator for these pipelines, the greater the value In the flow ratio (Wq), the larger the flow rate flowing through the pipeline, the larger the importance score (N) is set, and the average pressure change amount In (Ap), the importance score (N) of a larger value is set for a pipeline in which the pressure change exerted on the entire pipeline becomes larger at the time of damage. The larger the population, the larger the value It is to set the importance score (N). The correction coefficients α1 to α7 are arbitrarily set by an operator in order to match the weight values. still,
When the weight value is set, for example, in the case of the damage rate (Rm), the damage rate (Rm) and the weight value are stored in a table format in correspondence with each other, and when the weight value is given, the processing is read out from the table. It is also possible to set the form.

Next, a process for selecting a main line M for sending water from the water source S to the water supply point DP will be described. When this processing is performed, the entire pipe network PN is displayed on the display 1 based on the information from the pipe information file Fa as described above, and in the state displayed in this manner, as shown in the flowchart of FIG. By executing the main line search routine as the main line search means of the present invention, it becomes possible.
In other words, when this routine is executed, a message indicating that the water supply point DP should be selected is displayed, and the cursor is moved by operating the mouse 5 or the keyboard 4 in accordance with the instruction, thereby moving the cursor to a hospital or school or public facility where residents are evacuated in the event of an earthquake. Alternatively, the water supply point DP is designated by an operation such as setting a fire hydrant or the like at a position enabling efficient fire extinguishing when a fire occurs and operating a switch of the mouse 5 (step # 401).

When making this designation, as shown in FIG.
It is also possible to open another window W2 on the display 1 and specify the water supply point DP while displaying the enlarged pipe network in this window W2. And FIG.
In the pipe network PN schematically shown in FIG. 2, for example, when the maximum flow rate is sent to the route (main trunk M) shown by the broken line, when the water supply point DP is designated, the water supply point DP The intersection P1 at a close position is extracted, and the intersection P1
Is extracted, and then the flow direction and flow rate of each of the plurality of paths extracted in this way are obtained by hydraulic analysis, and the maximum flow rate among the paths for sending water to this intersection is obtained. A process for extracting a route is performed. Next, an intersection P2 on the upstream side in the path thus extracted is determined, all the paths connected at this intersection P2 are extracted, and the flow direction and the flow rate of the path are determined by hydraulic analysis to obtain the maximum flow rate. In the same drawing, the process of extracting the route to be determined is sequentially performed for the intersections P3 to P6 until it is determined that the route is directly connected to the water source S, and when it is determined that the route is directly connected to the water source S (# 402). ~ # 405 steps), the process of extracting intersections is stopped, the route extracted so far and the last extracted route are set as the main trunk M and displayed on the display 1 (see the figure). The process of adding the name of the water supply point DP and performing memory storage (storing) of information for identifying a plurality of pipelines forming the main trunk line M for the water supply point DP is performed (# 408, #). 409 steps)

The main trunk line M thus extracted is displayed so as to overlap the pipe network PN displayed on the display 1. In this display, the color of the pipeline indicating the main trunk line is changed. It is emphasized by making it different or blinking. In addition, the main line is connected to the water supply point DP from the water source S as described above.
Are formed by combining a plurality of pipelines, and the information for identifying the pipelines described above has a structure in which information for identifying these pipelines is continuous. The operator performs an operation of arbitrarily setting the importance score (N) for the pipeline configuring the main trunk line M corresponding to the DP. In addition, in the earthquake resistance cost calculation process (#C ′), the sum of the respective construction costs when replacing the pipes in each of the pipelines assuming the earthquake resistance in the earthquake resistance estimation process (#C) is stored.

The second estimation process (#D) is different from the second embodiment only in that a part of the pipeline is made earthquake-resistant in the earthquake-resistance assumption process (#C).
The processing to be performed is the same as the above-described first estimation processing (#A), and the damage estimation processing (#E) performed thereafter is also the same as the above-described damage estimation processing (#B). It has become.

In the comparison process (#F), the water interruption area and the water interruption rate estimated in the damage estimation processing (#B) are compared with the water interruption area estimated in the damage estimation processing (#E). The output process (#G) is a process, and as shown in FIG. 20, for example, as shown in FIG. 20, the window W3 is opened on the display 1 and the population and the rate of water interruption between "before earthquake resistance" and "after earthquake resistance" Is displayed as a numerical value, and at the same time, a region where water is cut off in the pipe network PN is displayed (a hatched region in the figure) so that the operator can easily grasp the comparison of damage. In addition, this system is configured so that the printer 6 can print the comparison result and the construction cost required for earthquake resistance.

As described above, in the present invention, the basic processing mode is set so as to estimate the damaged pipeline of the pipeline constituting the pipe network PN based on the earthquake information. Not only can simulation be easily performed for earthquakes with the same seismic intensity but different seismic intensities.In addition, the population and rate of water outage based on the estimated damage pipeline are calculated and saved, and the estimated damage It is assumed that the pipeline will be made earthquake-resistant based on the rules set in advance. By comparing with the water interruption rate, the evaluation of the pipe network before and after seismic retrofitting can be performed in a state of comparison, and even the calculation of the construction cost required for seismic retrofitting can be performed.

In particular, when estimating the damage pipeline to the earthquake, the damage probability of the pipeline included in the region Z is calculated for each of the plurality of regions Z divided and formed in a mesh shape, Since the damage pipeline is estimated by comparison, it is easy to assume and a reasonable pipeline based on the theory of probability is extracted, and the process of obtaining the amount of water leakage from the water pressure of the damaged pipeline extracted in this way and this water leakage The process of obtaining the water pressure based on the amount is repeated (iteratively) until the convergence is achieved, so that the water pressure of the pipeline can be obtained with high accuracy. Of these, the pipeline to be earthquake-resistant is selected according to a preset rule, so that it does not take time to select, and as a result of selection based on this rule, not only those that improve the population of water interruption and the rate of water interruption, Reduce damage to susceptible pipelines, promote seismic retrofitting of aging pipelines, avoid time-consuming restoration work during an earthquake disaster, and maintain water supply to hospitals and public facilities during an earthquake disaster In the event of an earthquake disaster, the water interruption area is reduced, and in the event of an earthquake disaster, the pressure drop in the entire pipe network PN is reduced. Further, since the pipe information file Fa for managing the pipe network PN can be used in the municipalities, it is not necessary to specially convert the pipe network PN into data, so that the processing can be easily performed.

When extracting the main trunk line M for maintaining water supply to a hospital or a public facility from the pipe network, an operation of designating a water supply point DP in the pipe network displayed on the display 1 is performed. The main trunk M is extracted only by executing the main trunk search process.

[Brief description of the drawings]

FIG. 1 is an overall view of a system.

FIG. 2 is a diagram showing a pipe network;

FIG. 3 is a block diagram showing a processing flow;

FIG. 4 is a block diagram showing the flow of information.

FIG. 5 is a flowchart of a first estimation process.

FIG. 6 is a diagram showing a mesh set in a pipe network;

FIG. 7 shows a structure of a pipeline information file.

FIG. 8 is a diagram showing a list of correction coefficients for pipe types;

FIG. 9 is a diagram showing a list of correction coefficients relating to a pipe diameter;

FIG. 10 is a diagram showing a list of correction coefficients relating to terrain and ground.

FIG. 11 is a diagram showing a list of correction coefficients relating to liquefaction.

FIG. 12 is a flowchart of damage estimation processing.

FIG. 13 is a graph showing the relationship between water pressure and water leakage.

FIG. 14 is a graph showing changes in water leakage, provisional water pressure, and water pressure during water pressure analysis of a water leakage pipe.

FIG. 15 is a flowchart of an earthquake resistance assumption process.

FIG. 16 is a diagram showing a list of expressions for weighting processing;

FIG. 17 is a schematic diagram of a pipe network.

FIG. 18 is a diagram showing a state where the entire pipe network and a part of the pipe network are displayed on a display.

FIG. 19 is a flowchart of a mainline search routine.

FIG. 20 is a diagram showing a state where a comparison result is displayed on a display;

[Explanation of symbols]

 1,6 output device 2 storage means 3 processing device

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Claims (5)

[Claims] 1. A damage estimation process for estimating a damaged pipeline from an earthquake simulation for a pipeline network, and an amount of water leakage in the damaged pipeline obtained in the damage estimation process is estimated.
A processing device is provided that performs a water pressure estimation process for obtaining the water pressure of the damaged pipeline based on the water leakage amount, compares the water pressure obtained in the water pressure estimation process with the set water pressure, and outputs the comparison result to an output device. Pressure estimation system for pipelines. 2. The damage estimation processing includes dividing the pipe network into a plurality of areas, obtaining a damage rate based on the acceleration of the seismic motion in each area, and calculating a damage pipe based on the damage rate and a random number. The system for estimating a water pressure of a pipeline according to claim 1, comprising a process of estimating a channel. 3. The processing device is configured to perform a process of replacing a selected one of the damaged pipelines estimated in the damage estimation process with the pipe network, assuming that the selected pipeline is an earthquake-resistant one. The system for estimating water pressure of a pipeline according to claim 1 or 2. 4. The water pressure estimating process includes: a water leak amount calculating process for obtaining a water leak amount based on a temporary water pressure set in a damaged pipeline; and a water pressure of a damaged pipeline based on the leak water amount to obtain a temporary water pressure. It is configured to include a water pressure calculation process to be set, and a temporary water pressure is obtained by a water pressure calculation process from the water leakage amount obtained in the water leakage amount calculation process, and a process of returning the temporary water pressure to the water leakage amount calculation process is repeatedly performed. When the provisional water pressure and the amount of water leakage reach a predetermined equilibrium state by this repetitive processing, the provisional water pressure in the equilibrium state, or the pipe water pressure obtained from this provisional water pressure is set to the water pressure of the pipe. The pipeline pressure estimation system according to any one of claims 1 to 3, wherein a processing mode is set. 5. The water pressure estimation of a pipeline according to claim 1, wherein a plurality of pipeline installation information stored in a storage unit is combined and used as the pipeline network. system.