Water supply and drainage pipeline modeling method and system based on BIM technology

Abstract

The invention relates to the technical field of computer-aided building design, and provides a water supply and drainage pipeline modeling method and system based on a BIM technology, and the method comprises the steps: obtaining an ideal speed at which a water flow reaches each position of a drainage pipeline according to the prior data of drainage pipeline modeling; calculating the bending resistance coefficient of the water flow in the drainage pipeline reaching the first intersection position of the drainage pipeline, determining the water flow intersection influence degree of the water flow in the drainage pipeline reaching the first intersection position of the drainage pipeline, and determining the actual water flow speed of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline; and screening the depth influence pipeline, determining the adjustment gradient of the depth influence pipeline, and obtaining the modeling result of the drainage pipeline according to the adjustment gradient of the depth influence pipeline, the gradient proportion of other drainage pipelines and the preset gradient. The drainage speed can reach the expectation.

Description

Technical Field

[0001] The present invention relates to the technical field of computer-aided architectural design, and particularly to a method and system for modeling water supply and drainage pipelines based on BIM technology. Background Art

[0002] The modeling of water supply and drainage pipelines based on BIM technology can visualize all drainage pipelines in the construction area in three dimensions, helping designers discover design conflicts of pipelines in advance, optimize pipeline layouts, reduce errors and rework during construction, reduce costs, and improve project quality. In a water supply and drainage pipe network, the water flow in the water supply system flows under the pressure in the pipeline, while the water flow in the drainage system flows under the influence of the inclination angle of the pipeline. When modeling water supply and drainage pipelines based on BIM technology, the slope of the horizontal drainage pipe is usually set to a fixed value.

[0003] However, during the actual use of drainage pipelines, turbulent flow will occur at the confluence of water flows in different directions in the pipeline, resulting in a change in the streamline of the original water flow in the pipeline, reducing the speed of the original water flow in the pipeline, that is, producing a blocking effect on the water flow in the pipeline, making the preset pipeline slope unable to achieve the original effective drainage effect. That is to say, the preset slope of the horizontal drainage pipe will be affected by the blocking effect generated at the water flow confluence, resulting in the problem that the actual drainage speed cannot reach the expected value. Summary of the Invention

[0004] The present invention provides a method and system for modeling water supply and drainage pipelines based on BIM technology to solve the problem that the preset slope of the horizontal drainage pipe is affected by the blocking effect generated at the water flow confluence, resulting in the actual drainage speed not reaching the expected value. The specific technical solutions adopted are as follows: In the first aspect, an embodiment of the present invention provides a method for modeling water supply and drainage pipelines based on BIM technology, and the method includes the following steps: According to the prior data of drainage pipeline modeling, obtain the ideal speed of the water flow in the drainage pipeline reaching each position of the drainage pipeline; According to the ideal speed and bending angle of each bending point during the process of the water flow in the drainage pipeline reaching the first confluence position of the drainage pipeline, and the ideal speed of the water flow in the drainage pipeline reaching the first confluence position of the drainage pipeline, calculate the bending resistance coefficient of the water flow in the drainage pipeline reaching the first confluence position of the drainage pipeline. Combine the included angle between the two drainage pipelines at the first confluence position of the drainage pipeline, the flow rates of the two drainage pipelines, and the ideal speed to determine the influence degree of the water flow confluence at the first confluence position of the drainage pipeline. According to the influence degree of the water flow confluence, determine the actual water flow speed of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline; Filter the depth - influencing pipes according to the number of other drainage pipes that flow into the drainage pipe and the length of the drainage pipe. Determine the adjusted slope of the depth - influencing pipe according to the difference between the actual water flow velocity and the ideal velocity when the water flow in the drainage pipe reaches the outlet position of the drainage pipe, the intersection position and diameter difference between the depth - influencing pipe and other drainage pipes, and the pipe length and preset slope of the depth - influencing pipe. Obtain the modeling result of the drainage pipe according to the adjusted slope of the depth - influencing pipe, the slope ratio of other drainage pipes and the preset slope.

[0005] Further, the calculation method of the bending resistance coefficient when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is as follows: Denote the ratio of the ideal velocity at the bending point during the process when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe to the ideal velocity when the water flow in the drainage pipe reaches the first intersection position as the first ratio at the bending point; Denote the product of the sine value of the bending angle at the bending point during the process when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe and the first ratio as the first product at the bending point; Denote the sum of the first products of all bending points between the position where the water flow in the drainage pipe reaches the first intersection position of the drainage pipe as the bending resistance coefficient when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe.

[0006] Further, the specific method for determining the influence degree of water flow intersection when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe by combining the included angle between the two drainage pipes at the first intersection position of the drainage pipe, the flow rates of the two drainage pipes, and the ideal velocity is as follows: Denote the drainage pipe with the longest length of water flow passage among the two intersecting drainage pipes at the drainage pipe intersection position as the main - stream pipe, and denote the other drainage pipe that is not the main - stream pipe as the branch pipe. Denote the sine value of the included angle between the main - stream pipe and the branch pipe when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe as the first angle value when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe; Determine the second ratio and the third ratio when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe according to the flow rates and ideal velocities of the two drainage pipes at the first intersection position of the drainage pipe respectively; Denote the product of the first angle value, the second ratio and the third ratio when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe as the influence degree of water flow intersection when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe.

[0007] Further, the method for respectively determining the second ratio and the third ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe according to the flow rates and ideal velocities of the two drainage pipes at the first intersection position of the drainage pipe includes the following specific methods: Denote the sum of the flow rates of the main pipeline and the branch pipeline of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe as the sum of the intersection flow rates, and denote the ratio of the flow rate of the branch pipeline of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe to the sum of the intersection flow rates as the second ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; Denote the negative correlation processing result of the bending resistance coefficient of the water flow in the branch pipeline reaching the first intersection position of the drainage pipe as the difference in the bending resistance coefficient of the branch pipeline, and denote the product of the ideal velocity of the water flow in the branch pipeline reaching the first intersection position of the drainage pipe and the difference in the bending resistance coefficient of the branch pipeline as the second product of the branch pipeline; Denote the negative correlation processing result of the bending resistance coefficient of the water flow in the main pipeline reaching the first intersection position of the drainage pipe as the difference in the bending resistance coefficient of the main pipeline, and denote the product of the ideal velocity of the water flow in the main pipeline reaching the first intersection position of the drainage pipe and the difference in the bending resistance coefficient of the main pipeline as the third product of the main pipeline; Denote the sum of the second product of the branch pipeline and the third product of the main pipeline as the first sum value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and denote the ratio of the second product of the branch pipeline to the first sum value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe as the third ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

[0008] Further, the method for determining the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe is as follows: Denote the negative correlation processing result of the product of the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe and the degree of influence of water flow intersection as the first difference of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and denote the product of the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe and the first difference as the actual water flow velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; Obtain the actual water flow velocities of the water flow in the drainage pipe reaching each intersection position of the drainage pipe; Update the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe to: the cumulative sum of the actual water flow velocities of all the intersection positions passed by the water flow before the outlet position of the drainage pipe and the outlet position of the drainage pipe.

[0009] Further, the method for screening the depth - influence pipelines according to the number of other drainage pipes into which the water flow in the drainage pipe flows and the length of the drainage pipe includes the following specific methods: The product of the length of the drainage pipe and the number of other drainage pipes that discharge water into the drainage pipe is denoted as the depth influence possibility of the drainage pipe. Divide the depth influence possibilities of all drainage pipes to obtain a division threshold. Any drainage pipe with a depth influence possibility greater than the division threshold is denoted as a depth influence pipe.

[0010] Furthermore, determining the adjusted slope of the depth influence pipe based on the difference between the actual water flow velocity and the ideal velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe, the intersection position and diameter difference between the depth influence pipe and other drainage pipes, and the pipe length and preset slope of the depth influence pipe includes the following specific methods: The ratio of the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe to the ideal velocity is denoted as the slope ratio of the drainage pipe. Based on the intersection position and diameter difference between the depth influence pipe and other drainage pipes, and the pipe length of the depth influence pipe, respectively determine the depth ratio and drainage load degree of the depth influence pipe. Take the adjusted slope of the depth influence pipe as the slope value, and take the product of the slope ratio of other drainage pipes that are not depth influence pipes and the preset slope as the slope value. Combine with other prior data of the drainage pipe modeling to obtain the modeling result of the drainage pipe.

[0011] Furthermore, determining the depth ratio and drainage load degree of the depth influence pipe based on the intersection position and diameter difference between the depth influence pipe and other drainage pipes, and the pipe length of the depth influence pipe includes the following specific methods: The sum of the vertical height from the lowest end of the depth influence pipe to the intersection point and the vertical height from the intersection point to the highest end of the depth influence pipe is denoted as the longitudinal depth corresponding to the intersection point. The maximum value of the longitudinal depths of all intersection points of the depth influence pipe is denoted as the depth requirement height of the depth influence pipe. The ratio of the depth requirement height of the depth influence pipe to the preset depth of the depth influence pipe is denoted as the depth ratio of the depth influence pipe. The intersection point is the intersection point between the depth influence pipe and other drainage pipes. The ratio of the diameter of the drainage pipe that conveys water to the depth influence pipe to the diameter of the depth influence pipe is denoted as the fourth ratio of the drainage pipe that conveys water to the depth influence pipe. The product of the length of the drainage pipe that conveys water to the depth influence pipe and the fourth ratio is denoted as the load contribution degree of the drainage pipe that conveys water to the depth influence pipe. The normalized value of the cumulative sum of the load contribution degrees of all drainage pipes that convey water to the depth influence pipe is denoted as the drainage load degree of the depth influence pipe.

[0012] Further, the method for obtaining the modeling result of the drainage pipeline according to the adjusted slope of the depth-influencing pipeline, the slope ratio of other drainage pipelines, and the preset slope includes the following specific steps: Denote the product of the slope ratio of the depth-influencing pipeline, the depth ratio, the drainage load degree, and the preset slope as the adjusted slope of the depth-influencing pipeline; Take the adjusted slope of the depth-influencing pipeline as the slope value, and take the product of the slope ratio of other drainage pipelines that are not depth-influencing pipelines and the preset slope as the slope value to obtain the modeling result of the drainage pipeline.

[0013] In a second aspect, an embodiment of the present invention further provides a water supply and drainage pipeline modeling system based on BIM technology, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the method described in any one of the above are implemented.

[0014] The beneficial effects of the present invention are as follows: First, according to the prior data of drainage pipeline modeling, Manning's formula, potential energy change formula, kinetic energy formula, and friction loss formula, the ideal velocity of the water flow reaching each position of the drainage pipeline is determined; first, the influence of the bending position before the water flow confluence position on the water flow is evaluated to determine the bending resistance coefficient at the confluence position. Since the water flow confluence position will produce a blocking effect, which causes the streamline of the original water flow in the pipeline to change and reduces the water flow velocity, further evaluate the degree of influence of the blocking effect generated at the water flow confluence, obtain the influence degree of the water flow confluence at the confluence position, and then determine the actual water flow velocity of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline according to the influence degree of the water flow confluence; when the actual water flow velocity of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline is smaller than the ideal velocity, the drainage pipeline is more affected by the blocking effect generated at the water flow confluence, and a larger slope needs to be set to help drainage. However, if each drainage pipeline is arranged with a slope according to the optimal drainage method, it will lead to too large a depth of the drainage pipe network composed of drainage pipelines, which is not conducive to actual construction. Therefore, it is necessary to further adjust the slope of the drainage pipeline considering the depth of the drainage pipe network composed of drainage pipelines, and determine the adjusted slope of the depth-influencing pipeline; finally, according to the adjusted slope of the depth-influencing pipeline, the slope ratio of other drainage pipelines, and the preset slope, determine the appropriate slope of the drainage pipeline, and obtain the modeling result of the drainage pipeline, so as to solve the problem that the preset slope of the horizontal drainage pipe will be affected by the blocking effect generated at the water flow confluence, resulting in the actual drainage speed not reaching the expected value. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 The flowchart of the method for modeling water supply and drainage pipelines based on BIM technology provided by an embodiment of the present invention; Figure 2 The flowchart for obtaining the bending resistance coefficient provided by an embodiment of the present invention. Specific embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Please refer to Figure 1 , which shows the flowchart of the method for modeling water supply and drainage pipelines based on BIM technology provided by an embodiment of the present invention. The method includes the following steps: Step S001, according to the prior data of drainage pipeline modeling, obtain the ideal speed of the water flow in the drainage pipeline reaching each position of the drainage pipeline.

[0019] When modeling water supply and drainage pipelines based on BIM technology, it is necessary to input the pipe diameters, pipe lengths, preset slopes, and prior flow rates of all water supply and drainage pipelines. Based on these data, the drainage pipe network can be modeled based on BIM technology to obtain the positions of all intersection points in each drainage pipeline and the spatial relationships and distances between the intersection points.

[0020] Generally, among the common diameters of drainage pipelines, the diameter of small residential drainage pipelines is 50 mm, which is suitable for drainage pipelines at positions such as washbasins and floor drains. The diameter of medium-sized drainage pipelines is 75 mm or 110 mm, which is suitable for drainage pipelines at positions such as bathrooms and kitchens. The diameter of large drainage pipelines is 150 mm, 200 mm or larger, which is suitable for drainage pipelines at positions such as main drainage pipelines and external drainage systems. In this embodiment, the value of the diameter of the drainage pipeline is 75 mm, the value of the pipe length of the drainage pipeline is 100 meters, the value of the preset slope of the drainage pipeline is 5%, and the prior flow rate of the drainage pipeline is the flow rate of half of the drainage pipeline area.

[0021] Since the change in potential energy of the water flow from the starting point to each position is equal to the sum of the kinetic energy and frictional losses of the water flow from the starting point to each position, taking the flow rate of half of the drainage pipe area as the prior flow rate of the drainage pipe, according to the slope calculated by the Manning formula, the calculation formula for the change in potential energy between two positions, the calculation formula for the kinetic energy between two positions, and the calculation formula for the frictional loss between two positions, the ideal velocity of the water flow in the drainage pipe reaching each position of the drainage pipe is obtained. Specifically, the calculation formula is: In the formula, represents the ideal velocity of the water flow in the drainage pipe reaching the position of the drainage pipe; represents the acceleration due to gravity; represents the slope of the drainage pipe. In this embodiment, the slope of the drainage pipe is a preset value, with a value of 5%; represents the distance of the water flow in the drainage pipe from entering the drainage pipe to the position of the drainage pipe; represents the Manning roughness coefficient; represents the radius of the drainage pipe.

[0022] Among them, the slope calculated by the Manning formula, the calculation formula for the change in potential energy between two positions, the calculation formula for the kinetic energy between two positions, the calculation formula for the frictional loss between two positions, and the calculation formula for the ideal velocity of the water flow in the drainage pipe reaching each position of the drainage pipe are all well-known technologies and will not be elaborated here.

[0023] Thus, the ideal velocity of the water flow in the drainage pipe reaching each position of the drainage pipe is obtained.

[0024] Step S002: According to the ideal velocities of the water flow in the drainage pipe at each bending point and the bending angles of each bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, calculate the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe. Combine the included angle between the two drainage pipes at the first intersection position of the drainage pipe, the flow rates of the two drainage pipes, and the ideal velocities to determine the influence degree of the water flow intersection of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe. According to the influence degree of the water flow intersection, determine the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe.

[0025] According to the ideal velocities of the water flow in the drainage pipe at each bending point and the bending angles of each bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, calculate the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

[0026] Preferably, in an embodiment of the present application, all the bending points between the water flow in the drainage pipe reaching the first intersection position of the drainage pipe are selected, and the ratio of the ideal velocity of the bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe to the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is denoted as the first ratio of the bending point; the product of the sine value of the bending angle of the bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe and the first ratio is denoted as the first product of the bending point. The sum of the first products of all the bending points between the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is denoted as the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

[0027] Specifically, the calculation formula of the bending resistance coefficient is: Wherein, represents the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; represents the number of all the bending points between the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; represents the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; represents the ideal velocity of the th bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; represents the th bending angle of the bending point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; represents the sine function.

[0028] The flow chart for obtaining the bending resistance coefficient is as Figure 2 shown.

[0029] According to the included angle between the two drainage pipes at the first intersection position of the drainage pipe, the flow rates of the two drainage pipes, the ideal velocity, and the bending resistance coefficient at the first intersection position of the drainage pipe, determine the influence degree of the water flow intersection when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe.

[0030] The intersection position of drainage pipes is the position where two different drainage pipes intersect. The drainage pipe with the longest length of water flow passage among the two intersecting drainage pipes at the intersection position of drainage pipes is denoted as the main trunk pipe, and the other drainage pipe that is not the main trunk pipe is denoted as the branch pipe. The sine value of the angle between the main trunk pipe and the branch pipe when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is denoted as the first angle value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; the flow rates of the main trunk pipe and the branch pipe when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe are denoted as the sum of the intersection flow rates, and the ratio of the flow rate of the branch pipe to the sum of the intersection flow rates when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is denoted as the second ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; the difference between the number 1 and the bending resistance coefficient of the water flow in the branch pipe reaching the first intersection position of the drainage pipe is denoted as the bending resistance coefficient difference of the branch pipe, and the product of the ideal velocity of the water flow in the branch pipe reaching the first intersection position of the drainage pipe and the bending resistance coefficient difference of the branch pipe is denoted as the second product of the branch pipe; the difference between the number 1 and the bending resistance coefficient of the water flow in the main trunk pipe reaching the first intersection position of the drainage pipe is denoted as the bending resistance coefficient difference of the main trunk pipe, and the product of the ideal velocity of the water flow in the main trunk pipe reaching the first intersection position of the drainage pipe and the bending resistance coefficient difference of the main trunk pipe is denoted as the third product of the main trunk pipe; the sum of the second product of the branch pipe and the third product of the main trunk pipe is denoted as the first sum value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the ratio of the second product of the branch pipe to the first sum value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is denoted as the third ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; the product of the first angle value, the second ratio, and the third ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is denoted as the influence degree of water flow intersection of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

[0031] The difference between the number 1 and the product of the bending resistance coefficient and the influence degree of water flow intersection of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is denoted as the first difference of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the product of the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe and the first difference is denoted as the actual water flow velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

[0032] According to the same method, the actual water flow velocities of the water flow in the drainage pipe reaching each intersection position of the drainage pipe are obtained.

[0033] Update the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe to: the sum of the actual water flow velocities at all the confluence positions that the water flow passes through before the outlet position of the drainage pipe and the outlet position of the drainage pipe.

[0034] Therefore, the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe can be obtained.

[0035] So far, the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe has been obtained.

[0036] Step S003, according to the number of other drainage pipes where the water flow converges into the drainage pipe and the length of the drainage pipe, screen the depth-influencing pipes. According to the difference between the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe and the ideal velocity, the confluence position and diameter difference between the depth-influencing pipes and other drainage pipes, and the pipe length and preset slope of the depth-influencing pipes, determine the adjusted slope of the depth-influencing pipes. According to the adjusted slope of the depth-influencing pipes, the slope ratio of other drainage pipes and the preset slope, obtain the modeling result of the drainage pipe.

[0037] Record the ratio of the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe to the ideal velocity as the slope ratio of the drainage pipe.

[0038] When the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe is smaller relative to the ideal velocity, the drainage pipe is more affected by the blocking effect generated at the water flow confluence, and a larger slope needs to be set to help drain water. However, it should be noted that if each drainage pipe is arranged with a slope according to the optimal drainage method, it will lead to too large a depth of the drainage pipe network composed of drainage pipes, which is not conducive to actual construction. Therefore, it is necessary to further adjust the slope ratio of the drainage pipe considering the depth of the drainage pipe network composed of drainage pipes.

[0039] According to the number of other drainage pipes where the water flow converges into the drainage pipe and the length of the drainage pipe, screen the depth-influencing pipes.

[0040] Specifically, record the product of the length of the drainage pipe and the number of other drainage pipes where the water flow converges into the drainage pipe as the depth-influence possibility of the drainage pipe. Use the Otsu method to divide the depth-influence possibilities of all drainage pipes to obtain the division threshold, and record the drainage pipes with a depth-influence possibility greater than the division threshold as depth-influencing pipes.

[0041] According to the confluence position between the depth-influencing pipes and other drainage pipes, determine the depth ratio of the depth-influencing pipes.

[0042] There are multiple intersection points between the depth - impact pipeline and other drainage pipelines. The sum of the vertical height from the lowest end of the depth - impact pipeline to the intersection point and the vertical height from the intersection point to the uppermost end of the depth - impact pipeline is denoted as the longitudinal depth corresponding to the intersection point. The maximum value of the longitudinal depths of all intersection points of the depth - impact pipeline is denoted as the depth - requirement height of the depth - impact pipeline. The ratio of the depth - requirement height of the depth - impact pipeline to the preset depth of the depth - impact pipeline is denoted as the depth ratio of the depth - impact pipeline.

[0043] Among them, it can be understood that the preset depth of the depth - impact pipeline is the ratio of the pipeline length of the depth - impact pipeline to the cosine value of the preset slope, which is prior data preset before the drainage pipeline is modeled.

[0044] When the diameter of the depth - impact pipeline is larger, the length is longer, and the more and larger - diameter drainage pipelines that transport water flow to the depth - impact pipeline are, the greater the amount of water that the depth - impact pipeline needs to transport. At this time, the necessity of setting a larger slope for the depth - impact pipeline is greater, and it is more necessary to ensure the smoothness of the water flow transported by the depth - impact pipeline.

[0045] Determine the drainage load degree of the depth - impact pipeline according to the intersection position of the depth - impact pipeline and other drainage pipelines, and the lengths of other drainage pipelines.

[0046] The ratio of the diameter of the drainage pipeline that transports water flow to the depth - impact pipeline to the diameter of the depth - impact pipeline is denoted as the fourth ratio of the drainage pipeline that transports water flow to the depth - impact pipeline. The product of the length of the drainage pipeline that transports water flow to the depth - impact pipeline and the fourth ratio is denoted as the load contribution degree of the drainage pipeline that transports water flow to the depth - impact pipeline. The normalized value of the cumulative sum of the load contribution degrees of all drainage pipelines that transport water flow to the depth - impact pipeline is denoted as the drainage load degree of the depth - impact pipeline.

[0047] In the process of calculating the drainage load degree of the depth - impact pipeline, the role of calculating the normalized value is to make the values of the drainage load degrees of all depth - impact pipelines greater than 0 and less than 1, and at the same time, make the cumulative sum of the values of the drainage load degrees of all depth - impact pipelines equal to 1.

[0048] Determine the adjusted slope of the depth - impact pipeline according to the slope ratio, depth ratio, drainage load degree, and preset slope of the depth - impact pipeline.

[0049] Specifically, the product of the slope ratio, depth ratio, drainage load degree, and preset slope of the depth - impact pipeline is denoted as the adjusted slope of the depth - impact pipeline.

[0050] Take the adjusted slope that longitudinally affects the pipeline as the slope value, and take the product of the slope ratio of other drainage pipelines that do not longitudinally affect the pipeline and the preset slope as the slope value. Keep other prior data for the drainage pipeline modeling unchanged, and obtain the modeling result of the drainage pipeline.

[0051] Thus, obtain the modeling result of the water supply and drainage pipeline based on the BIM technology.

[0052] Based on the same inventive concept as the above method, an embodiment of the present invention further provides a water supply and drainage pipeline modeling system based on the BIM technology, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above methods for the water supply and drainage pipeline modeling method based on the BIM technology.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. The water supply and drainage pipeline modeling method based on BIM technology is characterized by: The method comprises the following steps: According to the prior data of drainage pipe modeling, the ideal speed of water flow in the drainage pipe to each position of the drainage pipe is obtained; According to the ideal speed of each bending point and the bending angle of each bending point in the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the ideal speed of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is calculated, and the degree of influence of the water flow intersection when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is determined in combination with the angle between the two drainage pipes at the first intersection position of the drainage pipe, the flow rates of the two drainage pipes, and the ideal speed. According to the degree of influence of the water flow intersection, the actual water flow speed of the water flow in the drainage pipe reaching the outlet position of the drainage pipe is determined; According to the number of other drainage pipes that flow into the drainage pipe and the length of the drainage pipe, the depth-affected pipe is screened, and the adjusted slope of the depth-affected pipe is determined according to the difference between the actual water flow velocity and the ideal velocity of the water flow in the drainage pipe reaching the outlet of the drainage pipe, the intersection position and diameter difference between the depth-affected pipe and other drainage pipes, and the pipe length and preset slope of the depth-affected pipe. According to the adjusted slope of the depth-affected pipe, the slope ratio of other drainage pipes and the preset slope, the modeling result of the drainage pipe is obtained.

2. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The calculation method of the bending resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is: The ratio of the ideal speed of the water flow in the drainage pipe to the first intersection of the drainage pipe to the ideal speed of the water flow in the drainage pipe to the first intersection of the drainage pipe is recorded as the first ratio of the bending point; The product of the sine value of the bending angle of the bending point when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe and the first ratio is recorded as the first product of the bending point; The cumulative sum of the first products of all the bending points between the water flow in the drainage pipe and the first intersection of the drainage pipe is recorded as the bending resistance coefficient of the water flow in the drainage pipe to the first intersection of the drainage pipe.

3. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The method of determining the influence degree of water flow intersection of the water flow in the drainage pipe to the first intersection of the drainage pipe by combining the angle between the two drainage pipes at the first intersection of the drainage pipes, the flow rates of the two drainage pipes, and the ideal speed includes: The drainage pipe with the longest length through which the water flows in the two intersecting drainage pipes at the intersection of the drainage pipes is recorded as the main pipe, and the other drainage pipe that is not the main pipe is recorded as the branch pipe. The sine value of the angle between the main pipe and the branch pipe when the water in the drainage pipe reaches the first intersection of the drainage pipes is recorded as the first angle value of the water in the drainage pipe reaching the first intersection of the drainage pipes; According to the flow rates and ideal speeds of the two drainage pipes at the first intersection of the drainage pipes, respectively determining a second ratio and a third ratio for the water flow in the drainage pipes to reach the first intersection of the drainage pipes; The product of the first angle value, the second ratio and the third ratio at which the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is recorded as the water flow intersection influence degree at which the water flow in the drainage pipe reaches the first intersection position of the drainage pipe.

4. The water supply and drainage pipeline modeling method based on BIM technology according to claim 3 is characterized in that: The specific method of determining the second ratio and the third ratio of the water flow in the drainage pipe to the first intersection of the drainage pipe according to the flow rate and the ideal speed of the two drainage pipes at the first intersection of the drainage pipes is as follows: The flow rates of the main stream pipe and the tributary pipe of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe are recorded as the intersection flow sum, and the ratio of the flow rate of the tributary pipe of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe to the intersection flow sum is recorded as the second ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; The negative correlation processing result of the bending resistance coefficient when the water flow in the tributary pipe reaches the first intersection position of the drainage pipe is recorded as the bending resistance coefficient difference of the tributary pipe, and the product of the ideal speed at which the water flow in the tributary pipe reaches the first intersection position of the drainage pipe and the bending resistance coefficient difference of the tributary pipe is recorded as the second product of the tributary pipe; the negative correlation processing result of the bending resistance coefficient when the water flow in the main stream pipe reaches the first intersection position of the drainage pipe is recorded as the bending resistance coefficient difference of the main stream pipe, and the product of the ideal speed at which the water flow in the main stream pipe reaches the first intersection position of the drainage pipe and the bending resistance coefficient difference of the main stream pipe is recorded as the third product of the main stream pipe; the sum of the second product of the tributary pipe and the third product of the main stream pipe is recorded as the first sum value when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe, and the ratio of the second product of the tributary pipe to the first sum value when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is recorded as the third ratio of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

5. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The method for determining the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe is: The negative correlation processing result of the product of the bending resistance coefficient and the influence degree of water flow intersection when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is recorded as the first difference value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, and the product of the ideal speed of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe and the first difference is recorded as the actual water flow speed of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe; Obtaining the actual water flow velocity of the water flow in the drainage pipe reaching each intersection position of the drainage pipe; The actual water flow velocity of the water flow in the drainage pipe reaching the drainage pipe outlet position is updated to: the cumulative sum of the actual water flow velocity of the drainage pipe outlet position and all intersection positions where the water flow passes before the drainage pipe outlet position.

6. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The specific method of screening the pipelines that affect the depth according to the number of other drainage pipelines that flow into the drainage pipeline and the length of the drainage pipeline is as follows: The product of the length of the drainage pipe and the number of other drainage pipes that flow into the drainage pipe is recorded as the depth influence possibility of the drainage pipe; The depth influence possibilities of all drainage pipes are divided, and a division threshold is obtained. The drainage pipes whose depth influence possibilities are greater than the division threshold are recorded as depth influence pipes.

7. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The method of determining the adjustment slope of the depth-affecting pipe according to the difference between the actual water flow velocity and the ideal velocity of the water flow in the drainage pipe at the outlet of the drainage pipe, the intersection position and diameter difference between the depth-affecting pipe and other drainage pipes, and the pipe length and preset slope of the depth-affecting pipe includes: The ratio of the actual water flow velocity of the water in the drainage pipe to the outlet position of the drainage pipe to the ideal velocity is recorded as the slope ratio of the drainage pipe; According to the intersection position and diameter difference between the depth-affecting pipeline and other drainage pipelines, and the pipeline length of the depth-affecting pipeline, the depth ratio and drainage load degree of the depth-affecting pipeline are determined respectively; The adjusted slope of the pipeline affected by the depth is taken as the slope value, and the product of the slope ratio of other drainage pipes that are not affected by the depth and the preset slope is taken as the slope value. Combined with other prior data for drainage pipe modeling, the modeling result of the drainage pipe is obtained.

8. The water supply and drainage pipeline modeling method based on BIM technology according to claim 7 is characterized in that: The depth ratio and drainage load of the depth-affecting pipeline are determined according to the intersection position and diameter difference between the depth-affecting pipeline and other drainage pipelines and the pipeline length of the depth-affecting pipeline, and the specific method includes: The sum of the vertical height from the lowest end of the depth-affecting pipe to the intersection and the vertical height from the intersection to the highest end of the depth-affecting pipe is recorded as the longitudinal depth corresponding to the intersection; the maximum longitudinal depth of all intersections of the depth-affecting pipe is recorded as the required depth height of the depth-affecting pipe; the ratio of the required depth height of the depth-affecting pipe to the preset depth of the depth-affecting pipe is recorded as the depth ratio of the depth-affecting pipe, and the intersection is the intersection between the depth-affecting pipe and other drainage pipes; The ratio of the diameter of the drainage pipe that affects the water flow transported in the pipe in depth to the diameter of the pipe that affects the water flow transported in the pipe in depth is recorded as the fourth ratio of the drainage pipe that affects the water flow transported in the pipe in depth, the product of the length of the drainage pipe that affects the water flow transported in the pipe in depth and the fourth ratio is recorded as the load contribution of the drainage pipe that affects the water flow transported in the pipe in depth, and the normalized value of the accumulated sum of the load contributions of all the drainage pipes that affect the water flow transported in the pipe in depth is recorded as the drainage load of the pipe affected by the depth.

9. The water supply and drainage pipeline modeling method based on BIM technology according to claim 1 is characterized in that: The method of obtaining the modeling result of the drainage pipeline according to the adjustment slope of the pipeline affected by the depth, the slope ratio of other drainage pipelines and the preset slope includes: The product of the slope ratio of the depth-affecting pipeline, the depth ratio, the drainage load degree and the preset slope is recorded as the adjusted slope of the depth-affecting pipeline; The adjusted slope of the pipeline affected by the depth is taken as the slope value, and the product of the slope ratio of other drainage pipelines that are not affected by the depth and the preset slope is taken as the slope value to obtain the modeling result of the drainage pipeline.

10. A water supply and drainage pipeline modeling system based on BIM technology, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the water supply and drainage pipeline modeling method based on BIM technology as described in any one of claims 1 to 9 are implemented.

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