A municipal pipeline construction system based on BIM technology

Abstract

The present invention discloses a municipal pipeline construction system based on BIM technology, which relates to the technical field of municipal pipeline construction. By using BIM technology to establish a cubic model of the area to be constructed, dividing the model into several grids, constructing a grid map of the area to be constructed, and classifying the grids into three categories: obstacle grids, passable grids, and grids to be planned; calculating the volume ratio of the grids to be planned according to the obstacle size and the size of the pipeline to be wired, further classifying the grids to be planned, and sequentially defining the collision risk probabilities of each level of grids to be planned; taking not passing through the obstacle grids as the constraint condition of the wiring strategy for pipeline wiring to obtain an implementable pipeline route; calculating the construction risk value of the implementable pipeline route according to the defined collision risk probability, classifying the construction risk levels of the pipeline route in sequence by using the obtained construction risk value, and determining the pipeline route and construction strategy according to the classification result of the construction risk level.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal pipeline construction, and particularly relates to a municipal pipeline construction system based on BIM technology. Background Technique

[0002] With the rapid development of China's economy and the continuous acceleration of the urbanization process, the importance of municipal infrastructure construction, especially municipal pipe network construction, has become increasingly prominent. As an important supporting facility for urban municipal roads, the municipal pipe network covers various pipelines such as water supply, rainwater, sewage, power and telecommunications, gas, and heat. These pipelines are intertwined and distributed in the urban underground space, forming a complex pipe network system.

[0003] During the pipeline construction process, for the layout of small pipelines distributed in a complex and narrow space, due to their small size and construction difficulties such as a large number of turns, bifurcations, small space spans, and narrow available layout spaces, the constraint conditions for wiring are complex and numerous.

[0004] Generally, in the prior art, the grid method is usually used for wiring map modeling. In the traditional grid map modeling process, the insufficient parts in the grid map are usually regarded as obstacles or passable areas. Although this solution reduces the complexity of wiring, it will increase the probability of the appearance of redundant wiring space, thereby compressing the available layout space for subsequent pipelines and possibly leading to the path planning falling into an unsolvable state; in addition, it will also increase the risk of misjudgment during the wiring process, thereby increasing the possibility of pipeline layout collisions. Therefore, to solve the above possible problems, we propose a municipal pipeline construction system based on BIM technology. Summary of the Invention

[0005] The main object of the present invention is to provide a municipal pipeline construction system based on BIM technology, which can effectively solve the problems in the background technique.

[0006] To achieve the above object, the technical solution adopted by the present invention is

[0007] A municipal pipeline construction method based on BIM technology, the construction process of the method includes the following steps:

[0008] Step 1: Use BIM technology to establish a cubic model of the area to be constructed, divide the model into several grids of λ×λ×λ, construct a grid map of the area to be constructed, add a three-dimensional model of obstacles to the grid map, and classify the grids into obstacle grids, passable grids, and grids to be planned;

[0009] Step 2: Obtain the obstacle sizes and the sizes of the pipelines to be wired in all the grids to be planned, and calculate the volume ratio of the th grid to be planned , classifying the to-be-planned grids further by using the volume ratio, and defining the collision risk probabilities of various to-be-planned grids as , , , and 0 < < < < 1;

[0010] Step 3: Determine the starting point coordinates and ending point coordinates of the to-be-wired pipeline in the grid map, and perform pipeline wiring with the constraint that the obstacle grids are not passed through to obtain an implementable pipeline route , represented as the th implementable pipeline route, where is a non-negative integer;

[0011] Step 4: According to the defined collision risk probability, calculate the construction risk value of the th implementable pipeline route, and classify the construction risk levels of the pipeline routes into levels I, II, III, and IV in descending order according to the obtained construction risk values, and determine the pipeline routes and construction strategies according to the classification results of the construction risk levels.

[0012] In Step 1, the classification principle of the grids is:

[0013] The grids in the grid map that are occupied by obstacles less than a full grid are classified as to-be-planned grids;

[0014] The grids in the grid map without obstacle occupation are classified as passable grids;

[0015] The grids in the grid map that are occupied by obstacles full of a grid are classified as obstacle grids.

[0016] In Step 2, the calculation formula of the volume ratio is:

[0017]

[0018] In the formula, represents the volume value of the obstacle in the th to-be-planned grid; represents the pipeline radius value passing through the th to-be-planned grid; is the pipeline wiring correction coefficient of the th to-be-planned grid; is the pi; λ is the grid side length.

[0019] In Step 2, the further classification principle for the grilles to be planned is as follows:

[0020] When 0 < ≤ 1, the th grille to be planned is classified as a grille in a high collision risk area;

[0021] When 1 < ≤ 3, the th grille to be planned is classified as a grille in a medium collision risk area;

[0022] When > 3, the th grille to be planned is classified as a grille in a low collision risk area.

[0023] The construction risk value of the th grille to be planned for pipeline routing correction factor is calculated by the formula:

[0024]

[0025] In the formula, represents the spatial complexity of the th grille to be planned; and ; represents the volume value of the th obstacle in the th grille to be planned; represents the number of obstacles in the th grille to be planned; represents the type complexity of the th grille to be planned; represents the distribution complexity of the th grille to be planned; represents the weight of the spatial complexity of the th grille to be planned; represents the weight of the type complexity of the th grille to be planned; represents the weight of the distribution complexity of the th grille to be planned; and + + = 1; , , ∈ (0,1); is the natural constant.

[0026] In Step 4, the construction risk value of the th implementable pipeline route is calculated by the formula:

[0027] In the formula, represents the number of grids in the high collision risk area passed by the th implementable pipeline route; represents the number of grids in the medium collision risk area passed by the th implementable pipeline route; represents the number of grids in the low collision risk area passed by the th implementable pipeline route.

[0028] In step four, the principle for classifying the construction risk level is as follows:

[0029] When 0.6 < ≤ 1, the construction risk level of the pipeline route is level I;

[0030] When 0.5 < ≤ 0.6, the construction risk level of the pipeline route is level II;

[0031] When 0.1 < ≤ 0.5, the construction risk level of the pipeline route is level III;

[0032] When ≤ 0.1, the construction risk level of the pipeline route is level IV. The type complexity of the th grid to be planned is determined according to the following formula, specifically: = where, is the type of obstacle in the th grid to be planned;

[0033] The distribution complexity of the th grid to be planned is determined by the assignment method, specifically: = (1, 2), where, when the obstacles in the th grid to be planned are regularly distributed, take = 1; when the obstacles in the th grid to be planned are irregularly distributed, take = 2.

[0034] The system includes:

[0035] A grid map construction module, which is used to establish a cube model of the area to be constructed by using BIM technology, divide the model into several grids of λ×λ×λ, construct a grid map of the area to be constructed, and add a three-dimensional model of obstacles to the grid map;

[0036] The first grid classification module is used to classify the grids into three categories: obstacle grids, passable grids, and grids to be planned;

[0037] The data acquisition module is used to obtain the obstacle sizes and the sizes of the pipelines to be routed in all the grids to be planned, and calculate the volume ratio of the th grid to be planned according to the obtained size data ;

[0038] The second grid classification module is used to further classify the grids to be planned into high collision risk area grids, medium collision risk area grids, and low collision risk area grids by using the volume ratio;

[0039] The risk definition module is used to sequentially define the collision risk probabilities of the grids to be planned at all levels as , , , and 0 < < < < 1;

[0040] The pipeline route acquisition module is used to determine the starting point coordinates and the ending point coordinates of the pipeline to be routed in the grid map, and perform pipeline routing with the constraint that the obstacle grids are not passed through to obtain the implementable pipeline routes , denoted as the th implementable pipeline route, where is a non-negative integer;

[0041] The construction risk calculation module is used to calculate the construction risk value of the th implementable pipeline route according to the defined collision risk probability, classify the construction risk levels of the pipeline routes into levels I, II, III, and IV in descending order by using the obtained construction risk values, and determine the pipeline routes and construction strategies according to the classification results of the construction risk levels.

[0042] The system further includes a memory, a processor, and a computer program stored on the memory and executable on the processor.

[0043] The present invention has the following beneficial effects

[0044] Compared with the prior art, the technical solution of the present invention uses BIM technology to establish a cubic model of the area to be constructed, divides the model into a number of grids of λ×λ×λ, constructs a grid map of the area to be constructed, adds a three-dimensional model of obstacles to the grid map, classifies the grids into three categories: obstacle grids, passable grids, and grids to be planned, obtains the obstacle sizes and the sizes of the pipelines to be routed in all the grids to be planned, calculates the volume ratio of the th grid to be planned according to the obtained size data , further classifies the grids to be planned into high collision risk area grids, medium collision risk area grids, and low collision risk area grids by using the volume ratio, and defines the collision risk probabilities of each level of the grids to be planned as , , respectively, determines the starting point coordinates and the ending point coordinates of the pipeline to be routed in the grid map, performs pipeline routing with the condition that the obstacle grids are not passed through as the constraint of the routing strategy, obtains the pipeline routes that can be implemented, calculates the construction risk value of the th pipeline route that can be implemented according to the defined collision risk probability, classifies the construction risk levels of the pipeline routes into levels I, II, III, and IV in descending order by using the obtained construction risk values, and determines the pipeline routes and construction strategies according to the classification results of the construction risk levels, which can effectively solve the problems of increased probability of redundant routing space and increased risk of misjudgment in the routing process caused by the processing solution in the prior art that regards the partially unfilled part in the grid map as an obstacle or a passable area. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of the construction process of a municipal pipeline construction system based on BIM technology according to the present invention;

[0046] Figure 2 is a schematic diagram of the structure of a municipal pipeline construction system based on BIM technology according to the present invention;

[0047] Figure 3 is a schematic diagram of the grid map of the area to be constructed constructed in the technical solution of the present invention;

[0048] Figure 4 is a schematic diagram of the classification of obstacle grids, passable grids, and grids to be planned. DETAILED DESCRIPTION OF THE INVENTION

[0049] The present invention will be further described below in conjunction with specific embodiments. Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product.

[0050] The specific implementation process of the technical solution of the present invention includes the following steps:

[0051] Step 1: Use BIM technology to establish a cube model of the area to be constructed, divide the model into several grids of λ×λ×λ, and construct a grid map of the area to be constructed, as Figure 3 shown, and add a three-dimensional model of obstacles to the grid map;

[0052] The specific process includes:

[0053] 1) Establish a cube model of the area to be constructed

[0054] Use BIM modeling software, such as Revit, ArchiCAD, etc., to create a three-dimensional model of the area to be constructed. The model should include all relevant elements such as building structures, equipment, pipes, etc.

[0055] 2) Define the construction area

[0056] According to the construction plan, define the boundary of the area to be constructed. The area division tool in the software can be used to draw the boundary of the construction section.

[0057] 3) Divide the model into cube grids

[0058] Determine the grid size:

[0059] According to the construction requirements and accuracy requirements, determine the side length of the grid. The grid size should be small enough to capture the details in the construction area.

[0060] Generate grids:

[0061] Use the modeling function of BIM software to divide the area to be constructed into cube grids of λ×λ×λ. Specifically, it can be achieved through the following methods:

[0062] Manual division: In BIM software, manually create grid boundaries and divide the model into multiple cubes;

[0063] Automation tool: Use automation modeling tools such as Dynamo to generate grids through scripts.

[0064] 4) Construct a grid map

[0065] Extract grid information

[0066] Extract the geometric information and semantic information of each grille from the BIM model.

[0067] Gridding processing

[0068] Map the extracted grille information to a 2D or 3D map to form a grille map. The export function of BIM software can be used to export the grille information in a format supported by GIS or other mapping tools.

[0069] 5) Optimize the grille map:

[0070] Hole filling processing: For the possible holes in the model, use the triangular mesh hole filling algorithm to ensure the integrity of the grille;

[0071] Optimized segmentation: For the components spanning grilles, use Boolean operations for segmentation to ensure the integrity of the model information within each grille.

[0072] Step 2: Classify the grilles into three categories: obstacle grilles, passable grilles, and grilles to be planned; the classification principle is:

[0073] The grilles in the grille map that are occupied by obstacles less than full grids are classified as grilles to be planned;

[0074] The grilles in the grille map without obstacle occupancy are classified as passable grilles;

[0075] The grilles in the grille map that are fully occupied by obstacles are classified as obstacle grilles; the classification results are as Figure 4 shown.

[0076] Through the above steps, all the grilles in the grille map can be classified, which is convenient for subsequent searching of the pipeline routing using the path search algorithm. For passable grilles, they are the grilles where wiring can be carried out. For obstacle grilles, they are the grilles where wiring cannot be carried out. Whether the grilles to be planned can be wired needs to be analyzed according to the subsequent steps.

[0077] Step 3: Obtain the obstacle size and the size of the pipeline to be wired in all the grilles to be planned, and calculate the volume ratio of the th grille to be planned according to the obtained size data ; The volume ratio The calculation formula is:

[0078] In the formula, represents the volume value of the obstacle in the th grille to be planned; represents the radius value of the pipeline passing through the th grille to be planned; is the pipeline routing correction coefficient of the th grille to be planned; is the ratio of a circle's circumference to its diameter; λ is the side length of the grid. The correction coefficient for pipeline routing is calculated as follows:

[0079]

[0080] In the formula, represents the space complexity of the th grid to be planned; and ; represents the volume value of the th obstacle in the th grid to be planned; represents the number of obstacles in the th grid to be planned; represents the type complexity of the th grid to be planned; represents the distribution complexity of the th grid to be planned; represents the weight of the space complexity of the th grid to be planned; represents the weight of the type complexity of the th grid to be planned; represents the weight of the distribution complexity of the th grid to be planned; and + + = 1; , , ∈ (0, 1); is the natural constant; the type complexity of the th grid to be planned is determined according to the following formula, specifically: = , where is the type of obstacle in the th grid to be planned; the distribution complexity of the th grid to be planned is determined by the assignment method, specifically: = (1, 2), where when the obstacles in the th grid to be planned are regularly distributed, = 1; when the obstacles in the th grid to be planned are irregularly distributed, = 2.

[0081] Through the above steps, the volume ratio of all grids to be planned in the grid map can be obtained, and thus the space occupancy of the grids to be planned can be understood.

[0082] Specifically, for the method of obtaining the volume value of an obstacle:

[0083] Taking Revit software as an example

[0084] After creating a grid map and adding a solid model of an obstacle to the grid map, the extraction of the volume of the obstacle in the model can be achieved through the secondary development API of Revit. Specifically:

[0085] 1) Obtain the obstacle elements

[0086] First, it is necessary to obtain the obstacle elements in the model through the Revit API. Assuming that the obstacle elements have specific categories or parameters, these elements can be filtered through FilteredElementCollector.

[0087] 2) Calculate the volume of the obstacle

[0088] The volume of the obstacle can be calculated based on its geometric shape. If the obstacle is a family-based instance (such as furniture, equipment, etc.), the GeometryElement class can be used to obtain its geometric shape and then calculate the volume; for the calculation of the volume of some irregular obstacles, the obstacle can be decomposed into multiple simple geometric bodies (such as cubes, cylinders, etc.), then the volume of each simple geometric body is calculated separately, and finally they are added together and unit conversion is performed to ensure that the volume unit is consistent with the project requirements.

[0089] Taking ArchiCAD software as an example

[0090] After creating a grid map and adding a solid model of an obstacle to the grid map, it can be achieved by writing scripts or using plugins. Although ArchiCAD does not have an API like Revit, similar functions can be achieved through its built-in scripting language (such as GDL) or third-party plugins. And if the geometric shape of the obstacle is very complex, it can be operated similar to Revit software, decomposing the obstacle into multiple simple geometric bodies, calculating the volume separately and then adding them together, and then performing unit conversion to ensure that the volume unit is consistent with the project requirements.

[0091] Step 4: Further classify the to-be-planned grids into high collision risk area grids, medium collision risk area grids, and low collision risk area grids using the volume ratio; the classification principle is:

[0092] When 0 < ≤ 1, the th to-be-planned grid is classified as a high collision risk area grid;

[0093] When 1 < ≤ 3, the A grille to be planned is classified as a grille in a medium collision risk area;

[0094] When > 3, the th grille to be planned is classified as a grille in a low collision risk area.

[0095] Through the above steps, the grilles to be planned can be classified. For the grilles in the high collision risk area, they are the grilles where wiring operations can be carried out, but the risk of collision is relatively high; for the grilles in the medium collision risk area, they are also the grilles where wiring operations can be carried out, and the risk of collision is moderate; for the grilles in the low collision risk area, they are the grilles where wiring operations can be carried out, and the risk of collision is relatively low.

[0096] Step 5: Define the collision risk probabilities of the grilles to be planned at each level as , , , and 0 < < < < 1.

[0097] Through the above steps, the collision risk probabilities of the grilles to be planned can be artificially defined and set according to the actual situation of the construction, providing a certain operable space for construction wiring.

[0098] Step 6: Determine the starting point coordinates and the ending point coordinates of the pipeline to be wired in the grille map, and perform pipeline wiring with the condition that the obstacle grilles are not passed through to obtain the pipeline routes that can be implemented, denoted as the th pipeline route that can be implemented, where is a non - negative integer; among them, when = 0, it means that there is no pipeline route that can be implemented. Specifically, it can be achieved according to the following steps:

[0099] 1) Determine the starting point and ending point coordinates through the following method

[0100] Method 1: Extract the pipeline endpoint coordinates:

[0101] In the BIM model, taking the software tool Revit as an example for illustration, obtain the starting point and ending point coordinates of the pipeline. The center - line endpoint coordinates of the pipeline can be obtained using the Element.Location property.

[0102] For example, in Revit, the starting and ending point coordinates of a pipeline can be obtained through the LocationCurve.Curve.EndPoint property.

[0103] Method 2: Manually specify coordinates:

[0104] In some cases, the starting and ending points can also be manually selected. In BIM software, click on the starting and ending points, and the software will automatically display the coordinate parameters.

[0105] 2) Construct a grid map

[0106] Divide the grid

[0107] Divide the area to be constructed into a three-dimensional grid of λ×λ×λ. This can be achieved using BIM software such as Revit, or automation tools such as Dynamo;

[0108] Mark the obstacle grids

[0109] In the grid map, mark the grids that contain obstacles. Obstacles can be identified through collision detection tools, and the grids where they are located are marked as unavailable.

[0110] 3) Pipeline routing algorithm

[0111] The specific process includes:

[0112] Initialize the input: starting point coordinates and ending point coordinates , initialize the path list, and add the starting point to the path.

[0113] Path search algorithm:

[0114] Use a path search algorithm such as the A* algorithm or Dijkstra algorithm to find a path from the starting point to the ending point in the grid map, avoiding obstacle grids. The basic steps of the algorithm are as follows:

[0115] Define the heuristic function: For the A* algorithm, define the heuristic function h(n) as the Euclidean distance from the current grid to the ending point;

[0116] Priority queue: Use a priority queue to store the grids to be explored, sorted by the heuristic function value;

[0117] Explore the neighborhood: Explore the adjacent grids from the current grid, skipping obstacle grids and visited grids;

[0118] Update the path: Add the reachable neighboring grids to the path and update the priority queue;

[0119] Termination condition: Stop when the ending point is reached or the priority queue is empty.

[0120] Path Optimization:

[0121] Smoothing the path: Smooth the searched path to reduce unnecessary turning points;

[0122] Checking connectivity: Ensure that each grid on the path can be connected by pipes.

[0123] Output Results

[0124] Generating the wiring path: Output the final path as a pipe wiring scheme, including the coordinates of each grid on the path;

[0125] Visualization: Visualize the wiring path in the BIM model for easy understanding and operation by construction personnel.

[0126] Step 7: Calculate the construction risk value of the th implementable pipeline route according to the defined collision risk probability ; The construction risk value is calculated by the formula: ;

[0127] Wherein, represents the number of grids in the high collision risk area passed by the th implementable pipeline route; represents the number of grids in the medium collision risk area passed by the th implementable pipeline route; represents the number of grids in the low collision risk area passed by the th implementable pipeline route.

[0128] Step 8: Classify the construction risk levels of the pipeline routes from high to low in sequence as Grade I, Grade II, Grade III, and Grade IV by using the obtained construction risk values. Among them, the principles for classifying the construction risk levels are:

[0129] When 0.6 < ≤ 1, the construction risk level of the pipeline route is Grade I;

[0130] When 0.5 < ≤ 0.6, the construction risk level of the pipeline route is Grade II;

[0131] When 0.1 < ≤ 0.5, the construction risk level of the pipeline route is Grade III;

[0132] When ≤ 0.1, the construction risk level of the pipeline route is Grade IV.

[0133] Step 7: Determine the pipeline route and construction strategy according to the classification result of construction risk levels. For example, when the construction risk level of the pipeline route is Class I, it indicates that during the actual construction process, the pipeline to be constructed is prone to collision risks with existing pipelines or obstacles. At this time, re-routing or adopting other pipeline routes can be considered.

[0134] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for municipal pipelines based on BIM technology, characterized in that, The construction process of the described method includes the following steps: Step 1: Use BIM technology to establish a cubic model of the area to be constructed, divide the model into several grids of λ×λ×λ, construct a grid map of the area to be constructed, add a solid model of obstacles to the grid map, and classify the grids into obstacle grids, passable grids, and grids to be planned; Step 2: Obtain the sizes of the obstacles and the sizes of the pipelines to be routed in all the grilles to be planned, and calculate the volume ratio of the th grille to be planned. Further classify the grilles to be planned using the volume ratio, and sequentially define the collision risk probabilities of each type of grille to be planned as , , , and 0 < < < < 1; Step 3: Determine the starting point coordinates and ending point coordinates of the pipeline to be routed in the grid map, and perform pipeline routing with the constraint that the obstacle grids are not passed through to obtain an implementable pipeline route , denoted as the th implementable pipeline route, where is a non-negative integer; Step 4: Calculate the construction risk value of the th implementable pipeline route according to the defined collision risk probability . Classify the construction risk levels of the pipeline routes into levels I, II, III, and IV in descending order using the obtained construction risk values, and determine the pipeline routes and construction strategies based on the classification results of the construction risk levels; in Step 2, the further classification of the to-be-planned grid is into three categories: high collision risk area grid, medium collision risk area grid, and low collision risk area grid, where the collision risk probabilities are , , ; the specific classification principle is: When 0 < ≤ 1, the th grille to be planned is classified as a grille in a high collision risk area; When 1 < ≤ 3, the th grille to be planned is classified as a grille in the medium collision risk area; When > 3, the th grille to be planned is classified as a grille in a low collision risk area.

2. The municipal pipeline construction method based on BIM technology according to claim 1, characterized in that, In Step 1, the classification principle of the grids is as follows: The grids in the grid map that are not fully occupied by obstacles are classified as grids to be planned; The grids in the grid map without obstacles are classified as passable grids; The grids in the grid map that are fully occupied by obstacles are classified as obstacle grids.

3. A municipal pipeline construction method based on BIM technology according to claim 1, characterized in that In step two, the volume ratio is calculated by the formula: ; where represents the volume value of the obstacles in the th grille to be planned; represents the pipe radius value passing through the th grille to be planned; is the pipe routing correction factor for the th grille to be planned; is pi; λ is the side length of the grille.

4. A municipal pipeline construction method based on BIM technology according to claim 3, characterized in that, The pipeline routing correction factor for the th grille to be planned is calculated as follows: ; where represents the spatial complexity of the th grille to be planned; and ; represents the volume value of the th obstacle in the th grille to be planned; represents the number of obstacles in the th grille to be planned; represents the type complexity of the th grille to be planned; represents the distribution complexity of the th grille to be planned; represents the weight of the spatial complexity of the th grille to be planned; represents the weight of the type complexity of the th grille to be planned; represents the weight of the distribution complexity of the th grille to be planned; and + + = 1; , , ∈ (0, 1); is the natural constant.

5. A municipal pipeline construction method based on BIM technology according to claim 1, characterized in that In step four, the construction risk value of the implementable pipeline routes is calculated by the formula: ; where, represents the number of grids with a collision risk probability of in the th implementable pipeline route; represents the number of grids with a collision risk probability of in the th implementable pipeline route; represents the number of grids with a collision risk probability of in the th implementable pipeline route.

6. A municipal pipeline construction method based on BIM technology according to claim 1, characterized in that, In Step 4, the principle for dividing the construction risk levels is as follows: When 0.6 < ≤ 1, the construction risk level of the pipeline line is Class I; When 0.5 < ≤ 0.6, the construction risk level of the pipeline line is level II; When 0.1 < ≤ 0.5, the construction risk level of the pipeline line is level III; When ≤ 0.1, the construction risk level of the pipeline line is level IV.

7. A municipal pipeline construction method based on BIM technology according to claim 4, wherein The type complexity of the grids to be planned is determined according to the following formula: = , where is the type of obstacle in the th grid to be planned; The distribution complexity of the grids to be planned is determined according to the assignment method, specifically as follows: = (1, 2), where when the obstacles in the grids to be planned are regularly distributed, take = 1; when the obstacles in the grids to be planned are irregularly distributed, take = 2.

8. A municipal pipeline construction system based on BIM technology, characterized in that, The system is used to implement the steps of the construction process of the method described in claim 1, and includes: A grid map construction module, which is used to use BIM technology to establish a cubic model of the area to be constructed, divide the model into several grids of λ×λ×λ, construct a grid map of the area to be constructed, and add a solid model of obstacles to the grid map; A first grid classification module, which is used to classify the grids into three categories: obstacle grids, passable grids, and grids to be planned; The data acquisition module is used to obtain the sizes of the obstacles and the sizes of the pipelines to be wired in all the to-be-planned grilles, and calculate the volume ratio of the th to-be-planned grille according to the obtained size data; A second grid classification module, which is used to further classify the grids to be planned into high collision risk area grids, medium collision risk area grids, and low collision risk area grids by using the volume ratio; A risk definition module, which is used to sequentially define the collision risk probabilities of each level of the to-be-planned grille as , , , and 0 < < < < 1; A pipeline route acquisition module, which is used to determine the starting point coordinates of the pipeline to be routed in the grid map and the ending point coordinates , and perform pipeline routing with the constraint that the obstacle grids are not passed through as the wiring strategy, and obtain the pipeline routes that can be implemented , denoted as the th pipeline route that can be implemented, where is a non-negative integer; The construction risk calculation module is used to calculate the construction risk value of the pipeline route that can be implemented according to the defined collision risk probability of the pipeline route described in item . The construction risk levels of the pipeline route are classified into levels I, II, III, and IV in descending order by using the obtained construction risk values, and the pipeline route and construction strategy are determined according to the classification results of the construction risk levels.

9. A municipal pipeline construction system based on BIM technology, characterized in that, The system further includes a memory, a processor, and a computer program stored on the memory and executable on the processor. Among them, when the processor executes the program, it can implement the steps of the construction process of the method described in claim 1.

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