BIM Technology-Based Modeling Method and System for Water Supply and Drainage Pipelines

Abstract

The present invention relates to the technical field of computer-aided architectural design, and provides a method and system for modeling water supply and drainage pipelines based on BIM technology, including: obtaining the ideal speed of water flow reaching each position of the 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 influence degree of water flow intersection when the water flow in the drainage pipeline reaches the first intersection position, and determining the actual water flow speed of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline; screening the pipelines with in-depth influence, determining the adjusted slope of the pipelines with in-depth influence, and obtaining the modeling result of the drainage pipeline according to the adjusted slope of the pipelines with in-depth influence, the slope ratio of other drainage pipelines and the preset slope. The present invention can make the drainage speed reach the expected value.

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] 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 in pipelines in advance, optimize pipeline layouts, reduce errors and rework during construction, lower 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 inside 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, having 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:

[0005] In a first aspect, an embodiment of the present invention provides a method for modeling water supply and drainage pipelines based on BIM technology, the method comprising the following steps:

[0006] Obtain the ideal speed of the water flow in the drainage pipeline reaching each position of the drainage pipeline according to the prior data of the drainage pipeline modeling;

[0007] 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, determine the influence degree of the water flow confluence at the first confluence position of the drainage pipeline, and 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;

[0008] Filter the depth - impact 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 - impact pipe based on 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 - impact pipe and other drainage pipes, and the pipe length and preset slope of the depth - impact pipe. Obtain the modeling result of the drainage pipe according to the adjusted slope of the depth - impact pipe, the slope ratio of other drainage pipes, and the preset slope.

[0009] Furthermore, the calculation method for the bending resistance coefficient when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe is as follows:

[0010] Record 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 to the ideal velocity when the water flow in the drainage pipe reaches the first intersection position as the first ratio of the bending point;

[0011] Record 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 and the first ratio as the first product of the bending point;

[0012] Record the cumulative 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 as the bending resistance coefficient when the water flow in the drainage pipe reaches the first intersection position.

[0013] Furthermore, the specific method for determining the degree of influence of water flow intersection when the water flow in the drainage pipe reaches the first intersection position 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:

[0014] Record 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 record the other drainage pipe that is not the main - stream pipe as the branch pipe. Record 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 as the first angle value when the water flow in the drainage pipe reaches the first intersection position;

[0015] Determine the second ratio and the third ratio when the water flow in the drainage pipe reaches the first intersection position according to the flow rates and ideal velocities of the two drainage pipes at the first intersection position of the drainage pipe respectively;

[0016] Record 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 as the degree of influence of water flow intersection when the water flow in the drainage pipe reaches the first intersection position.

[0017] 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:

[0018] Record 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 record the ratio of the flow rate of the branch pipeline of the water flow in the drainage pipe reaching the first intersection position 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;

[0019] Record 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 record 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; record 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 record 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; record 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 record 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.

[0020] 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:

[0021] Record 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 record 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;

[0022] Obtain the actual water flow velocities of the water flow in the drainage pipe reaching each intersection position of the drainage pipe;

[0023] 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.

[0024] Further, the method for screening the depth - impact pipes 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 steps:

[0025] Multiply the length of the drainage pipe by the number of other drainage pipes into which the water flow in the drainage pipe flows, and denote it as the depth - impact possibility of the drainage pipe.

[0026] Divide the depth - impact possibilities of all drainage pipes to obtain a division threshold, and mark all drainage pipes with depth - impact possibilities greater than the division threshold as depth - impact pipes.

[0027] Further, the method for determining the adjusted slope of the depth - impact pipes 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 position of the drainage pipe, the intersection position and diameter difference between the depth - impact pipes and other drainage pipes, and the pipe length and preset slope of the depth - impact pipes includes the following specific steps:

[0028] Denote 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.

[0029] According to the intersection position and diameter difference between the depth - impact pipes and other drainage pipes, and the pipe length of the depth - impact pipes, respectively determine the depth ratio and drainage load of the depth - impact pipes.

[0030] Take the adjusted slope of the depth - impact pipes as the slope value, take the product of the slope ratio of other drainage pipes that are not depth - impact pipes and the preset slope as the slope value, and combine with other prior data of drainage pipe modeling to obtain the modeling result of the drainage pipe.

[0031] Further, the method for respectively determining the depth ratio and drainage load of the depth - impact pipes according to the intersection position and diameter difference between the depth - impact pipes and other drainage pipes, and the pipe length of the depth - impact pipes includes the following specific steps:

[0032] Add the vertical height from the lowest end of the depth - impact pipe to the intersection point and the vertical height from the intersection point to the uppermost end of the depth - impact pipe, and denote it as the longitudinal depth corresponding to the intersection point. Denote the maximum value of the longitudinal depths of all intersection points of the depth - impact pipe as the depth - demand height of the depth - impact pipe. Denote the ratio of the depth - demand height of the depth - impact pipe to the preset depth of the depth - impact pipe as the depth ratio of the depth - impact pipe. The intersection point is the intersection point between the depth - impact pipe and other drainage pipes.

[0033] The ratio of the diameter of the drainage pipe that transports water flow to the depth - influencing pipe to the diameter of the depth - influencing pipe is denoted as the fourth ratio of the drainage pipe that transports water flow to the depth - influencing pipe. The product of the length of the drainage pipe that transports water flow to the depth - influencing pipe and the fourth ratio is denoted as the load contribution degree of the drainage pipe that transports water flow to the depth - influencing pipe. The normalized value of the cumulative sum of the load contribution degrees of all drainage pipes that transport water flow to the depth - influencing pipe is denoted as the drainage load degree of the depth - influencing pipe.

[0034] Furthermore, the specific method for obtaining 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 includes:

[0035] The product of the slope ratio of the depth - influencing pipe, the depth ratio, the drainage load degree, and the preset slope is denoted as the adjusted slope of the depth - influencing pipe.

[0036] Taking the adjusted slope of the depth - influencing pipe as the slope value, and taking the product of the slope ratio of other drainage pipes that are not the depth - influencing pipe and the preset slope as the slope value to obtain the modeling result of the drainage pipe.

[0037] In a second aspect, an embodiment of the present invention also provides a water supply and drainage pipe 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, it implements the steps of the method described in any one of the above.

[0038] The beneficial effects of the present invention are:

[0039] First, according to the prior data for 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 in the drainage pipeline is determined. First, the influence of the bend position before the water flow convergence position on the water flow is evaluated to determine the bend resistance coefficient at the convergence position. Since a blocking effect occurs at the water flow convergence position, which causes the streamline of the original water flow in the pipeline to change and reduces the water flow velocity, the degree of influence of the blocking effect generated at the water flow confluence is further evaluated to obtain the influence degree of the water flow convergence at the convergence position. Then, based on the influence degree of the water flow convergence, the actual water flow velocity of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline is determined. When the actual water flow velocity of the water flow in the drainage pipeline reaching the outlet position of the drainage pipeline is smaller relative to 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 assist drainage. However, if each drainage pipeline is arranged with a slope according to the optimal drainage method, it will result in an excessive depth of the drainage pipe network composed of drainage pipelines, which is not conducive to actual construction. Therefore, considering the depth of the drainage pipe network composed of drainage pipelines, the slope of the drainage pipeline needs to be further adjusted to determine the adjusted slope of the pipeline affected by the depth. Finally, based on the adjusted slope of the pipeline affected by the depth, the slope ratio of other drainage pipelines, and the preset slope, the appropriate slope of the drainage pipeline is determined to obtain the modeling result of the drainage pipeline, solving 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. Description of the Drawings

[0040] In order 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 It is a schematic flowchart of a method for modeling water supply and drainage pipelines based on BIM technology provided by an embodiment of the present invention;

[0042] Figure 2 It is a flowchart for obtaining the bend resistance coefficient provided by an embodiment of the present invention. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figure 1 , which shows a flowchart of a method for modeling water supply and drainage pipes based on BIM technology provided by an embodiment of the present invention. The method includes the following steps:

[0045] Step S001, according to the prior data of drainage pipe modeling, obtain the ideal speed of the water flow in the drainage pipe reaching each position of the drainage pipe.

[0046] When modeling water supply and drainage pipes 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 pipes. 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 pipe and the spatial relationships and distances between the intersection points.

[0047] Generally, among the common drainage pipe diameters, the diameter of the drainage pipe for small residential buildings is 50 mm, which is suitable for drainage pipes at positions such as washbasins and floor drains. The diameter of the medium-sized drainage pipe is 75 mm or 110 mm, which is suitable for drainage pipes at positions such as bathrooms and kitchens. The diameter of the large drainage pipe is 150 mm, 200 mm or larger, which is suitable for drainage pipes at positions such as main drainage pipes and external drainage systems. In this embodiment, the value of the drainage pipe diameter is 75 mm, the value of the pipe length of the drainage pipe is 100 meters, the value of the preset slope of the drainage pipe is 5%, and the prior flow rate of the drainage pipe is the flow rate of half of the drainage pipe area.

[0048] 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 loss 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 Manning formula for calculating the slope, 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, obtain the ideal speed of the water flow in the drainage pipe reaching each position. Specifically, the calculation formula is:

[0049]

[0050] In the formula, represents the ideal speed of the water flow in the drainage pipe reaching the position of the drainage pipe; represents the acceleration due to gravity; Indicates the slope of the drainage pipe. In this embodiment, the slope of the drainage pipe is a preset value, with a value of 5%. Indicates the distance of the water flow in the drainage pipe from the inlet of the drainage pipe to the position of the drainage pipe ; Indicates the Manning roughness coefficient; Indicates the radius of the drainage pipe.

[0051] Among them, the calculation formulas for the slope calculated by the Manning formula, the change in potential energy between two positions, the kinetic energy between two positions, the frictional loss between two positions, and 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.

[0052] Thus, the ideal velocity of the water flow in the drainage pipe reaching each position of the drainage pipe is obtained.

[0053] Step S002: According to the ideal velocity of the water flow in the drainage pipe at each bending point and the bending angle 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 velocity 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.

[0054] According to the ideal velocity of the water flow in the drainage pipe at each bending point and the bending angle 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.

[0055] 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. The ratio of the ideal velocity of the water flow at 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.

[0056] Specifically, the calculation formula for the bending resistance coefficient is as follows:

[0057]

[0058] Among them, represents the bending resistance coefficient when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe; represents the number of all bending points between the water flow in the drainage pipe and the first intersection position of the drainage pipe; represents the ideal velocity when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe; represents the th ideal velocity of the bending point during the process when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe; represents the th bending angle of the bending point during the process when the water flow in the drainage pipe reaches the first intersection position of the drainage pipe; represents the sine function.

[0059] The flowchart for obtaining the bending resistance coefficient is as shown in Figure 2 shown.

[0060] 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.

[0061] 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 pipeline, and the other drainage pipe that is not the main pipeline is denoted as the branch pipeline. The sine value of the angle between the main pipeline and the branch pipeline 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 pipeline and the branch pipeline 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 pipeline 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 pipeline reaching the first intersection position of the drainage pipe is denoted as the bending resistance coefficient difference of the branch pipeline, and 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 bending resistance coefficient difference of the branch pipeline is denoted as the second product of the branch pipeline; the difference between the number 1 and the bending resistance coefficient of the water flow in the main pipeline reaching the first intersection position of the drainage pipe is denoted as the bending resistance coefficient difference of the main pipeline, and 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 bending resistance coefficient difference of the main pipeline is denoted as the third product of the main pipeline; the sum of the second product of the branch pipeline and the third product of the main pipeline 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 pipeline 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] So far, the actual water flow velocity of the water flow in the drainage pipe reaching the outlet position of the drainage pipe is obtained.

[0067] 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 difference in the confluence position and diameter 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.

[0068] 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.

[0069] 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 with drainage. However, it should be noted that if each drainage pipe is arranged with a slope according to the optimal drainage method, it will cause the depth of the drainage pipe network composed of drainage pipes to be too large, 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.

[0070] 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.

[0071] 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 maximum inter-class variance 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.

[0072] According to the confluence position of the depth-influencing pipes and other drainage pipes, determine the depth ratio of the depth-influencing pipes.

[0073] There are multiple intersection points between the depth - impact pipeline and other drainage pipelines. Denote the sum of the vertical height from the lowermost 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 as the longitudinal depth corresponding to the intersection point. Denote the maximum value of the longitudinal depths of all intersection points of the depth - impact pipeline as the depth - demand height of the depth - impact pipeline. Denote the ratio of the depth - demand height of the depth - impact pipeline to the preset depth of the depth - impact pipeline as the depth - ratio of the depth - impact pipeline.

[0074] 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.

[0075] When the diameter of the depth - impact pipeline is larger, the length is longer, and there are more and larger - diameter drainage pipelines that transport water flow to the depth - impact pipeline among other drainage pipelines that intersect with the depth - impact pipeline, the amount of water that the depth - impact pipeline needs to transport is larger. 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.

[0076] 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.

[0077] Denote 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 as the fourth ratio of the drainage pipeline that transports water flow to the depth - impact pipeline. Denote the product of the length of the drainage pipeline that transports water flow to the depth - impact pipeline and the fourth ratio as the load contribution degree of the drainage pipeline that transports water flow to the depth - impact pipeline. Denote 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 as the drainage load degree of the depth - impact pipeline.

[0078] 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.

[0079] 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.

[0080] Specifically, denote the product of the slope ratio, depth - ratio, drainage load degree, and preset slope of the depth - impact pipeline as the adjusted slope of the depth - impact pipeline.

[0081] 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.

[0082] So far, obtain the modeling result of the water supply and drainage pipeline based on the BIM technology.

[0083] Based on the same inventive concept as the above method, the embodiment of the present invention also 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.

[0084] 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. A method for modeling water supply and drainage pipelines based on BIM technology, characterized in that, The method includes the following steps: According to the prior data of drainage pipe modeling, obtain the ideal velocity of the water flow in the drainage pipe reaching each position of the drainage pipe; According to the ideal velocities of each bend point and the bend angles of each bend point during the process of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, as well as the ideal velocity of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, calculate the bend 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 velocity to 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. 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; 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. Denote 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. According to the intersection position and diameter difference between the depth-influencing pipe and other drainage pipes, and the pipe length of the depth-influencing pipe, respectively determine the depth ratio and drainage load of the depth-influencing pipe. Take the adjusted slope of the depth-influencing pipe as the slope value, and take the product of the slope ratio of other drainage pipes that are not depth-influencing pipes and the preset slope as the slope value. Combine other prior data of drainage pipe modeling to 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, obtain the modeling result of the drainage pipe.

2. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, wherein, The calculation method of the bend resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe is as follows: Denote the ratio of the ideal velocity of the water flow at the bend 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 as the first ratio of the bend point; Denote the product of the sine value of the bend angle of the bend 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 as the first product of the bend point; Denote the cumulative sum of the first products of all bend points between the water flow in the drainage pipe reaching the first intersection position of the drainage pipe as the bend resistance coefficient of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe.

3. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, characterized in that, The specific method for determining 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 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 the water flow passing through 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 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 respectively; Denote the product of the first angle value of the water flow in the drainage pipe reaching the first intersection position of the drainage pipe, the second ratio and the third ratio as 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.

4. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 3, wherein, The specific method included in "determine 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 respectively" is as follows: 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.

5. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, wherein The determination method of 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 and 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 as the first difference value 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 value 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.

6. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, characterized in that, The specific method included in "screen the depth - influence pipelines according to the number of other drainage pipes where the water flow into the drainage pipe and the length of the drainage pipe" is as follows: 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; Classify the depth influence possibilities of all drainage pipes to obtain a classification threshold. Drainage pipes with a depth influence possibility greater than the classification threshold are all denoted as depth influence pipes.

7. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, characterized in that, The specific methods for respectively determining the depth ratio and drainage load degree of the depth influence pipes according to the intersection positions and diameter differences between the depth influence pipes and other drainage pipes, and the pipe length of the depth influence pipes are as follows: 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 uppermost 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, and 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.

8. The method for modeling water supply and drainage pipelines based on BIM technology according to claim 1, characterized in that, The specific methods for obtaining the modeling result of the drainage pipe according to the adjusted slope of the depth influence pipe, the slope ratios of other drainage pipes, and the preset slope are as follows: The product of the slope ratio, depth ratio, drainage load degree, and preset slope of the depth influence pipe is denoted as the adjusted slope 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 to obtain the modeling result of the drainage pipe.

9. 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, it implements the steps of the BIM technology-based water supply and drainage pipe modeling method according to any one of claims 1-8.

Images