JP7455054B2 - Pipeline function evaluation method and conduit design method - Google Patents

Description

The present invention relates to a method for evaluating the function of pipes and a method for designing pipes that constitute a water distribution pipe network in which a water distribution reservoir and individual water demand points are connected by a plurality of pipes.

A water distribution pipe network is composed of a plurality of pipes laid in a mesh pattern to distribute water from a water reservoir serving as a water source to individual water demand points. Water supply pipes are branched and connected to water distribution pipes that serve as water demand points, and water distributed from the water pipes is supplied to houses and facilities via the water supply pipes.

Patent Document 1 states that in order to reduce the effects of water outages that occur due to earthquakes, etc., the main water distribution pipes that distribute water to important facilities such as evacuation facilities are identified in advance, and the main water distribution pipes are For the purpose of carrying out seismic retrofitting work on the pipe network, the main route is to extract the route that supplies the most water from the water source to the water supply point, which is a water demand point, arbitrarily set in the pipe network. A trunk line extraction method is disclosed.

The main line extraction method involves arbitrarily specifying a water supply point in a pipe network to which water is supplied from a water source, and then selecting the route with the highest flow rate among multiple routes between this water supply point and the water source. It is configured to find and output the main trunk line, and when searching for the main trunk line, it extracts the route that supplies the most water to the intersection closest to the water supply point, and then outputs the route extracted in this way. It is configured to repeat the process according to the rule of extracting the route that supplies the most water to the upstream intersection until the water source is reached, and to set the multiple routes extracted in this way as the main route. ing.

Patent No. 4901371

Distribution pipes that supply tap water from distribution reservoirs to each consumer are divided into two types: distribution mains whose main function is to transport tap water from the distribution reservoir to the water supply area, and water distribution pipes whose main function is to transport tap water from the distribution reservoir to the water supply area. It is divided into water distribution branch pipes whose main function is to distribute water.

Structurally, the distribution pipes are divided according to the presence or absence of water supply branches to each consumer, and in some cases, a distribution pipe without a water supply branch is considered a main distribution pipe, and a water supply pipe with a water supply branch is considered a distribution pipe, or a threshold value is set for the diameter of the water distribution pipe. Generally, the side that is thicker than the threshold value is the main water distribution pipe, and the side that is thinner than the threshold value is the branch pipe.

When carrying out economical construction of water distribution pipes on existing pipe networks while ensuring firefighting water availability, such as earthquake-resistance work or replacement of old water pipes, it is necessary to replace the main water distribution pipes from the perspective of ensuring water transmission function. It is necessary to ensure a sufficient diameter, and when considering the placement of fire hydrants, it is economically desirable to place them in water distribution branch pipes that are close to the water distribution main pipe, which has an advantageous water delivery function. .

Furthermore, in consideration of the water outage rate when a water distribution pipe is damaged by an earthquake, it is desirable that the water supply pipe is not branched and connected to the main water distribution pipe, which has an advantageous water transmission function. Most disasters are caused by damage to water supply pipes, so if a large number of water supply pipes are branched and connected, it will be a cause of delays in restoring water outages in areas downstream of the water pipes. Furthermore, from an economic point of view, it is desirable to reduce the diameter of water distribution branch pipes whose diameter can be considered.

Therefore, it is very important to understand the functions of the above-mentioned water distribution main pipes and water distribution branch pipes.

However, in the main trunk line extraction method described in Patent Document 1, it is not determined whether or not the water supply pipe is branched to the extracted main line. It was not possible to determine whether it was a pipe or a pipe whose main function was water distribution.

As a result, planners had to subjectively distinguish between main distribution pipes and branch pipes based on diameters, flow rates obtained through hydraulic analysis, etc., making it difficult to develop uniform distribution pipes. .

In addition, if the water supply area is in a mountainous area and the water distribution pipes are arranged in a dendritic pattern, in urban areas where the water distribution branch network is extensive, the main water distribution pipes may not be fully developed and may also function as water supply. Another problem was that it became difficult to set conditions for examining the diameter using hydraulic analysis.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a method for evaluating the function of a pipeline, which can easily determine whether an existing water distribution pipe has a water transmission function as its main function or a water distribution function as its main function. The point is that it provides a design method.

In order to achieve the above-mentioned object, the first characteristic configuration of the method for evaluating the function of pipes according to the present invention is that the pipes constituting a water distribution pipe network in which a plurality of pipes connect a water distribution reservoir and individual water demand points. A functional evaluation method for calculating pipe network characteristic values including the amount of water sent to each water demand point and the amount of water distributed from each water demand point by performing hydraulic analysis on the water distribution pipe network. Based on the analysis step and the function evaluation value obtained by the function evaluation function whose variables are the pipe network characteristic values obtained in the hydraulic analysis step, each The main feature is that it includes a pipe function evaluation step to evaluate whether the main function is to distribute water to the demand destination.

By executing the hydraulic analysis step on the water distribution pipe network, pipe network characteristic values including the amount of water sent to each water demand point and the amount of water distributed from each water demand point are obtained. Based on the function evaluation value determined by the function evaluation function using the obtained pipe network characteristic values as variables, it is possible to objectively evaluate whether the main function of the pipeline to be evaluated is water transmission or water distribution. become.

In addition to the first characteristic configuration described above, the second characteristic configuration is that the function evaluation function is calculated by the following formula: (amount of water conveyed in the pipeline to be evaluated)/(distribution from the pipeline to be evaluated to the demand destination). If the functional evaluation value is equal to or higher than a predetermined water distribution threshold, the pipeline to be evaluated is evaluated as a pipeline whose main function is water transmission, and if the functional evaluation value is equal to or higher than a predetermined water distribution threshold, If so, the pipeline to be evaluated is evaluated as a pipeline whose main function is water distribution.

The function evaluation function is preferably defined by the following formula: (amount of water conveyed in the pipeline to be evaluated)/(amount of water distributed from the pipeline to be evaluated to the demand destination), and the larger this value is, the more the water transmission function is the main function. It can be evaluated that the water distribution function is the main function as this value is smaller.

The third characteristic configuration is that in addition to the first characteristic configuration described above, the function evaluation function is calculated using the following formula: (Water supply amount in the evaluation target pipeline x Pipe length of the evaluation target pipeline) / (Evaluation target If the function evaluation value is equal to or higher than a predetermined water transmission threshold, the evaluation target pipeline is a pipeline whose main function is water transmission. If the function evaluation value is equal to or higher than a predetermined water distribution threshold value, the evaluation target pipeline is evaluated to be a pipeline mainly having a water distribution function.

The functional evaluation function is defined by the following formula: Water flow rate in the pipeline being evaluated x Pipe length of the pipeline being evaluated) / (Amount of water distributed from the pipeline being evaluated to the demand destination / Pipe length of the pipeline being being evaluated) It is preferable that the value of this formula, which is weighted by the length of the pipeline to be evaluated, is larger, the water delivery function can be evaluated as the main function, and the smaller this value is, the water distribution function can be evaluated as the main function.

The fourth characteristic configuration further includes a display step of displaying a pipe network diagram corresponding to the water distribution pipe network on a display device, in addition to any of the first to third characteristic configurations described above, and the display step The purpose of this invention is to visualize the functions of the conduits in a distinguishable manner by changing the display mode including the display color of each conduit according to each function evaluation value.

In the display step, a pipe network diagram corresponding to the water distribution pipe network is displayed on the display device by changing the display mode including the display color of each pipe in accordance with each functional evaluation value obtained in the pipe function evaluation step. This makes it possible to instantly visually identify the function of the conduit.

A first characteristic configuration of the pipeline design method according to the present invention is to execute a pipeline function evaluation method having any of the first to fourth characteristic configurations described above, and to perform water supply based on the functional evaluation value. After identifying pipes that have been evaluated as having water supply as their main function, fire hydrants are placed preferentially in pipes that have been evaluated as having water supply as their main function.

Based on the results of executing the method for evaluating the function of a pipeline that has any of the characteristic configurations from the first to the fourth above, a pipeline that has been evaluated as having a main function of water conveyance is identified, and the pipeline is By prioritizing the placement of fire hydrants, it is possible to reduce the impact on water distribution pipes, which have a superior water distribution function, while supplying enough water to respond to emergencies such as fires.

The second characteristic configuration is obtained by executing the method for evaluating the function of a pipeline having any of the characteristic configurations described in the first to fourth aspects above, and based on the functional evaluation value, it is evaluated that the main function is water conveyance. Evaluate whether the pipes are arranged in a continuous route from the water distribution reservoir to the water demand area, and if the route includes a pipe whose main function is water distribution, the pipe whose main function is water distribution is determined. The point is to add a conduit that bypasses the duct.

Based on the results of executing the method for evaluating the function of a pipeline having any of the characteristic configurations from the first to fourth characteristics described above, a pipeline that is evaluated to have a main function of water conveyance is determined to be suitable for the water demand area from the water distribution reservoir. If the route includes a pipe whose main function is water distribution, it is possible to add a pipe that bypasses the pipe whose main function is water distribution. , it will be possible to speed up recovery while ensuring resilience against unexpected water outage incidents such as earthquakes.

The third feature configuration is obtained by executing the function evaluation method of a pipeline having any of the above-mentioned feature configurations from the first to the fourth, and based on the function evaluation value, it is evaluated that the main function is water conveyance. When the pipes are arranged in a tree shape from the water distribution reservoir to the water demand area, a pipe line connecting the pipes arranged in the tree shape is added to form a loop.

Based on the results of executing the functional evaluation method for pipelines having any of the characteristic configurations described in the first to fourth aspects, the pipelines evaluated to have the main function of water transmission will be When pipes are arranged in a dendritic manner toward the target, by adding pipes that connect the pipes arranged in a tree to create a loop, it is possible to ensure resistance against unexpected water outages such as earthquakes. This will allow for faster recovery.

As explained above, according to the present invention, a method for evaluating the function of a pipe and a method for designing a pipe can easily determine whether an existing water pipe has a water transmission function or a water distribution function as its main function. It is now possible to provide

Functional block diagram of pipe network analysis device (a) to (c) are explanatory diagrams of the pipeline network. (a) and (b) are explanatory diagrams of hydraulic analysis calculations Explanatory diagram of the method for evaluating the function of pipes Explanatory diagram of the procedure for evaluating the function of pipes (a) is an explanatory diagram of a pipe network whose functionality has been evaluated, (b) is an explanatory diagram of a pipe network in which countermeasures have been taken

Hereinafter, a method for evaluating the function of a conduit and a method for designing a conduit according to the present invention will be explained based on the drawings.
[Configuration of the pipe network analysis device that executes the pipe function evaluation method]
The pipe network analysis equipment consists of a general-purpose personal computer equipped with a motherboard equipped with a CPU, a memory board, etc., and is also equipped with storage devices such as a hard disk, a touch panel type liquid crystal display, and input devices such as a keyboard and mouse. It is composed of

An OS program for managing the system is installed in the storage device, and a pipe network analysis program is installed as an application program executed under the management of the OS program.

FIG. 1 shows functional blocks of a pipe network analysis device 1. The pipe network analysis device 1 includes a calculation unit 2 mainly realized by a motherboard and a memory board, a data storage unit 3 mainly realized by a storage device, a display unit 4 realized by a liquid crystal display, and a keyboard and a mouse. It is equipped with an input section 5 realized by. The pipe network analysis device 1 performs hydraulic analysis on a water distribution pipe network for water supply, in which a water distribution reservoir and individual water demand points are connected by a plurality of pipes, and analyzes the pipe network at any water demand point. Calculate characteristic values. Pipe network characteristic values refer to characteristic values that can grasp the movement and condition of water in a pipe network, and include values such as water pressure, residual chlorine concentration, and water volume.

The calculation unit 2 includes an analysis condition setting unit 20 that sets analysis conditions for the pipe network to be analyzed, a hydraulic analysis unit 21 that performs hydraulic analysis on the pipe network for which the analysis conditions have been set, and the results of the hydraulic analysis. For example, it includes an analysis result processing section 22 that executes preset processing.

The data storage unit 3 includes a pipe network diagram storage area 30 that stores a pipe network diagram representing the water distribution pipe network connecting the water distribution reservoir to each water demand point, and component information such as pipes that make up the pipe network diagram ( A pipe information storage area 31 in which pipe type, diameter, pipe length, etc.) and installation information (date of installation, construction company, etc.) are stored, and an analysis result storage area 33 in which analysis results by the hydraulic analysis section 21 are stored. It is equipped with such things as

[Procedure of pipeline function evaluation method]
As shown in FIG. 5, the analysis condition setting unit 20 reads pipe network information consisting of a pipe network diagram and pipe information from the data storage unit 3 (S1), and the flow velocity coefficient C of the pipe and the configuration extracted from each node are read. Once analysis conditions such as water volume are set (S2), hydraulic analysis is executed by the hydraulic analysis unit 21 (S3).

As a result of the analysis, a water supply amount and a water distribution amount are assigned to the specific pipeline to be evaluated, and a functional evaluation value is calculated (S4). When functional evaluation values are calculated for all specific pipes that require evaluation (S5), the analysis results and evaluation results are stored in the analysis result storage area 33 by the analysis result processing section 22, and the display section 4 A pipe network diagram reflecting the functional evaluation value is displayed (S7). The pipe network diagram reflecting the functional evaluation value is a pipe network diagram in which the display mode including the display color of each pipe line is changed according to the functional evaluation value so that the function of the pipe line can be identified and visualized.

In FIG. 2(a), a water distribution pipe network 6 is illustrated. The water distribution pipe network 6 is configured to include a plurality of pipes 9 connecting each water demand point 8 in order to distribute water from an upstream water distribution reservoir 7 to a plurality of water demand points 8 . In the water distribution pipe network 6, connection points between pipes that are water demand points are called nodes.

For example, the hydraulic analysis unit 21 calculates the hydraulic head at each node using a nodal head method, and the flow rate of each pipe can be calculated from the calculated hydraulic head.
The above Hazen-Williams equation H=10.666×(L×Q ^1.85 )/(C ^1.85 ×d ^4.87 )
and the flow rate equation Σ(±Q _ij )=P _i which is the continuity conditional expression for the flow rate at the node 8 illustrated in FIG. 3(a).
And, the closed pipe equation Σ(±H _ks )−δE _k =0 shown in FIG. 3(b)
The water head etc. can be found as a simultaneous solution of .

Here, H is the friction head of the pipe (m), L is the pipe length (m), Q is the flow rate (m ³ /s), d is the actual inner diameter of the pipe (m), C is the flow velocity coefficient, and Q _ij is the flow rate of each pipe connected to the node of interest, and P _i is the amount of water supplied from the node. In addition, the closed pipe equation is such that the water in the pipe network minimizes the overall energy loss, that is, in a pipe network where the number of pipes is J, ΣQ _j H _j , j = 1 to J is the minimum. It flows as it should. A closed pipe equation is obtained by solving ΣQ _j H _j →min using the flow rate equation as a constraint.

The analysis condition setting unit 20 reads necessary information such as pipe length, pipe diameter, and height of each node including the water distribution reservoir from the pipe information storage area 31, sets the flow velocity coefficient C for each pipe, and also sets the flow velocity coefficient C for each pipe. Set the amount of water extracted from the demand point as analysis conditions.

The hydraulic analysis unit 21 determines the flow direction in each pipe as shown by the arrow in FIG. 2(b) by determining simultaneous solutions of the above-mentioned mathematical expressions based on the analysis conditions. As shown by the thick solid line in FIG. 2(c), for example, assuming that the water demand point to be analyzed is the node 8n, the pipe 9 necessary for distributing water from the water distribution reservoir 7 to the node 8n is specified, and the flow rate flowing through each pipe is calculated.

Furthermore, the hydraulic analysis unit 21 determines whether the pipeline to be evaluated is based on the functional evaluation value obtained by the functional evaluation function using the pipe network characteristic values (water supply amount, water distribution amount, etc.) obtained through the hydraulic analysis as variables. Evaluate whether the main function is to transport water from the distribution reservoir or to distribute water to each customer. The amount of water sent refers to the amount of water sent downstream via a water distribution pipe, and the amount of water distributed refers to the amount of water distributed to customers from the water supply pipes branched into the water distribution pipe.

In this way, the water supply amount of each pipe and the water distribution amount from each node are determined for the pipe network to be analyzed, and when the main function of each water pipe is evaluated, the analysis result processing unit 22 The results are stored in the analysis result storage area 33, and the pipe network is displayed on the display unit 4, and the function of each pipe can be identified by changing the display mode including the display color of each pipe according to each function evaluation value. Visualize it.

For example, the display color of the pipe is divided into a plurality of stages based on the magnitude of the functional evaluation value, and the color tone of the pipe is changed from a warm color to a cool color in accordance with the divided stage. Further, the thickness of the conduit may be changed so that it becomes gradually thinner in order from the evaluation value with the largest value to the evaluation value with the smallest value, or the color and thickness may be combined.

Furthermore, in addition to displaying all the pipes in one color in advance, a color bar is displayed on the screen that changes the display color of the pipes from warm to cool in order from the highest evaluation value to the lowest evaluation value. When you specify any display color on the corresponding color bar with the mouse, the display color of the corresponding pipe among the pipes that make up the pipe network may change to the same color, or it may blink. good.

[Explanation of functional evaluation values]
The above-mentioned functional evaluation value will be explained.
The method for evaluating the functionality of the pipes that make up the distribution pipe network, which connects the water distribution reservoir and individual water demand points with multiple pipes, is to perform hydraulic analysis on the water distribution pipe network and calculate the results for each water demand point. A hydraulic analysis step that calculates pipe network characteristic values including the amount of water conveyed and the amount of water distributed from each water demand point, and a functional evaluation value obtained by a function evaluation function whose variables are the pipe network characteristic values obtained in the hydraulic analysis step. and a pipe function evaluation step of evaluating whether the main function of the pipe to be evaluated is to transport water from the water distribution reservoir or to distribute water to each demand destination, based on the above.

The function evaluation function is the following formula,
(Amount of water conveyed in the pipeline to be evaluated) / (Amount of water distributed from the pipeline to be evaluated to the demand destination)
If the functional evaluation value is greater than or equal to a predetermined water distribution threshold, the pipeline to be evaluated is evaluated as a pipeline whose main function is water conveyance, and if the functional evaluation value is greater than or equal to the predetermined water distribution threshold, the pipeline to be evaluated is The pipeline is evaluated as a pipeline whose main function is water distribution. The larger this value is, the water supply function can be evaluated as the main function, and the smaller this value is, the water distribution function can be evaluated as the main function.

As shown in FIG. 4, consider water pipes 9a, 9b connecting three nodes 8a, 8b, 8c. As a result of the above-mentioned hydraulic analysis, water with a flow rate of Q1 is sent from node 8a to water distribution pipe 9a, water with a flow rate of Q1 is sent from node 8b to water distribution pipe 9b, and water with a flow rate of Q3 is sent from node 8c to the downstream water pipe. Water is being delivered. At this time, three water supply pipes are branched and connected to the water distribution pipe 9a, and water is distributed at flow rates q1, q2, and q3, respectively, and one water supply pipe is branched and connected to the water distribution pipe 9b, and water is distributed at a flow rate q4. Assume a case. At this time, Q2=Q1-q1-q2-q3, and Q3=Q2-q4. Further, the pipe extension of the water pipe 9a is L1, and the pipe extension of the water pipe 9b is L2.

When the values obtained by hydraulic analysis are substituted into the functional evaluation function for each of the water pipes 9a and 9b, the evaluation value for the water pipe 9a is as follows.
Evaluation value V (9a) = Q1/(q1+q2+q3)
The evaluation value for the water pipe 9b is
Evaluation value V (9b) = Q2/q4 = (Q1-q1-q2-q)/q4
That's what I find.

In this way, the evaluation value V for a given water pipe becomes higher as the amount Q of water flowing into the water pipe increases, and increases as the amount q of water distributed from the water pipe decreases. A predetermined threshold value is set for the evaluation value V, and if the evaluation value V is higher than the threshold value, the pipe can be evaluated as having a water distribution function as its main function, and if the evaluation value V is lower than the threshold value, it can be evaluated that the main function is the water distribution function. It can be evaluated that it is a functional water pipe. Note that the threshold value is not particularly limited and may be set as appropriate.

The threshold value for determining a water pipe whose main function is water transmission and the threshold value for determining a water pipe whose main function is water distribution can be set to different values. It is also possible to determine that the main functions are both the water supply function and the water distribution function. In this way, the main function can be determined based on the evaluation value of each water pipe that constitutes the pipe network.

FIG. 6A shows an example of a pipe network diagram in which water pipes are laid from the water distribution reservoir 7 to each demand destination D. In FIG. 6, each customer is represented by a broken line. A water supply pipe (not shown) is branched and connected to each consumer from the nearest water pipe.

In this example, each water pipe is divided into four groups based on the above-mentioned evaluation value V, and the water pipe whose main function is the water conveyance function with a high evaluation value V is represented as the thickest, and the water distribution pipe with a low evaluation value V is represented as the main function. Water pipes whose main function is water pipes are shown thinly. A water pipe represented by an intermediate thickness is a water pipe that has both a water conveying function and a water distribution function. Note that although the evaluation value V is expressed by the thickness of the line, the display mode including the display color of each conduit may be changed to visualize the function of the conduit so that it can be identified.

As is clear from FIG. 6(a), the main function of the water distribution pipes 9A and the like near the water distribution reservoir 7 is the water conveyance function, and they are shown in bold. On the other hand, the water distribution pipe 9N installed in an area with many consumers D is a water pipe whose main function is water distribution, and is shown thinly.

A water pipe 9B, which is shown thinly, is arranged between the water pipe 9A, whose main function is a water supply function, which is shown thickly, and 9C, which is shown thinly. If a water supply pipe connected to the water distribution pipe 9B ruptures due to an earthquake or the like and a water outage occurs, it becomes difficult to send water to the downstream side of the water distribution pipe 9C. According to the present invention, such weak points can be objectively found, a pipe network with strong resistance to accidents can be constructed, and fire hydrants can be placed in appropriate positions, making it possible to improve efficiency. It will be possible to conduct a comprehensive pipe network evaluation. For example, by preferentially locating fire hydrants in distribution pipes with superior water distribution functions, it is possible to reduce the impact on distribution pipes with superior water distribution functions, while also ensuring sufficient water volume to respond to emergencies such as fires. be able to supply it.

For example, as shown in FIG. 6(b), a design in which a water pipe 9D is installed to bypass the water pipe 9B, and a new water pipe 9E is installed so that water can be sent to the downstream side of the water pipe 9C. becomes possible. By evaluating the functionality of the current pipe network, it becomes possible to strengthen weak parts and design efficient maintenance that is highly reliable and reduces costs.

For example, in the pipeline design method according to the present invention, a pipeline that has been evaluated as having a main function of water conveyance is Evaluate whether or not the route is laid out in a continuous route toward the water demand area, and if the route includes a pipeline whose main function is water distribution, a pipeline that bypasses the pipeline whose main function is water distribution is evaluated. It can be configured to add.

As a result, if a route includes a pipe whose main function is water distribution, by adding a pipe that bypasses the pipe whose main function is water distribution, the system will be able to withstand unexpected water outages such as earthquakes. It will be possible to speed up recovery while ensuring that

In addition, if pipes that are evaluated as having the main function of water conveyance based on the functional evaluation value are arranged in a tree shape from the distribution reservoir to the water demand area, the pipes arranged in the tree shape are By adding connecting pipes and configuring them to form a loop, it is possible to ensure resilience against unexpected water outages such as earthquakes, and to speed up restoration.

Another embodiment will be described below.
It is also possible to use the following formula as the function evaluation function explained using FIG. 4.
(Amount of water conveyed in the pipeline to be evaluated x Pipe length of the pipeline to be evaluated) / (Amount of water distributed from the pipeline to be evaluated to the customer / Pipe length of the pipeline to be evaluated)
In the example of FIG. 4, the evaluation value for the water pipe 9a is
Evaluation value V(9a)=Q1×L1/{(q1+q2+q3)/L1}
The evaluation value for the water pipe 9b is
Evaluation value V(9b)=Q2×L2/(q4/L2)
That's what I find.

The larger the value of this formula weighted by the pipe length L of the pipeline to be evaluated, the more the water delivery function can be evaluated as the main function, and the smaller this value, the more the water distribution function can be evaluated as the main function.

The embodiment described above is only one embodiment of the present invention, and the scope of the present invention is not limited by the description. It is possible to change the design as appropriate within the range.

1: Pipe network analysis device 2: Calculation section 3: Data storage section 4: Display section 5: Input section 20: Analysis condition setting section 21: Hydraulic analysis section 22: Analysis result processing section

Claims (7)

A method for evaluating the function of pipes constituting a water distribution pipe network in which a water distribution reservoir and individual water demand points are connected by a plurality of pipes, the method comprising:
a hydraulic analysis step of performing a hydraulic analysis on the water distribution pipe network to calculate pipe network characteristic values including the amount of water sent to each water demand point and the amount of water distributed from each water demand point;
Based on the function evaluation value obtained by the function evaluation function whose variable is the pipe network characteristic value obtained in the hydraulic analysis step, it is determined whether the main function of the pipeline to be evaluated is to transport water from the distribution reservoir to each demand destination. A pipe function evaluation step to evaluate whether the main function is water distribution;
A method for evaluating the function of conduits equipped with The function evaluation function is expressed by the following formula,
(Amount of water conveyed in the pipeline to be evaluated) / (Amount of water distributed from the pipeline to be evaluated to the demand destination)
is defined as
If the function evaluation value is greater than or equal to a predetermined water supply threshold, the evaluation target pipeline is evaluated as a pipeline whose main function is water conveyance, and if the function evaluation value is greater than or equal to a predetermined water distribution threshold, the evaluation target pipe is 2. The method for evaluating the function of a pipe according to claim 1, wherein the pipe is evaluated as having a main water distribution function. The function evaluation function is expressed by the following formula:
(Amount of water conveyed in the pipeline to be evaluated x Pipe length of the pipeline to be evaluated) / (Amount of water distributed from the pipeline to be evaluated to the demand destination / Pipe length of the pipeline to be evaluated)
is defined as
If the function evaluation value is greater than or equal to a predetermined water distribution threshold, the evaluation target pipeline is evaluated as a pipeline whose main function is water conveyance, and if the function evaluation value is greater than or equal to a predetermined water distribution threshold, the evaluation target pipeline is 2. The method for evaluating the function of a pipe according to claim 1, wherein the pipe is evaluated as having a main water distribution function. The display step further includes a display step of displaying a pipe network diagram corresponding to the water distribution pipe network on a display device, and the display step changes the display mode including the display color of each pipe line according to each functional evaluation value to display the pipe network diagram. The method for evaluating the function of a conduit according to any one of claims 1 to 3, wherein the function is visualized so that the function can be identified. The method for evaluating the function of a pipe line according to any one of claims 1 to 4 is executed, and after identifying a pipe line that has been evaluated as having a main function of water supply based on the function evaluation value, a fire hydrant is used to supply water. A method of designing conduits that prioritizes placement of conduits that have been evaluated as having the main function. The method for evaluating the function of a conduit according to any one of claims 1 to 4 is executed, and the conduit that is evaluated to have a main function of water conveyance based on the functional evaluation value is directed from the water distribution reservoir to the water demand area. If the route includes a pipeline whose main function is water distribution, we will design a pipeline that bypasses the pipeline whose main function is water distribution. Method. The method for evaluating the function of a conduit according to any one of claims 1 to 4 is executed, and the conduit that is evaluated to have a main function of water conveyance based on the functional evaluation value is directed from the water distribution reservoir to the water demand area. A method for designing a conduit in which, when the conduits are arranged in a dendritic manner, a conduit is added to connect the conduits arranged in a dendritic manner to form a loop.

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