Intelligent analysis system for spatial position of urban underground pipe network

Abstract

The invention relates to the technical field of data processing, in particular to an urban underground pipe network spatial position intelligent analysis system, which comprises a data acquisition module for acquiring the length and the position information of each pipeline in an underground pipe network in an area adjacent to a foundation pit according to a digital map; the model building module is used for determining grid size parameters of the numerical simulation analysis method, and comprises the following steps: acquiring each pipeline section of each pipeline; determining a first difference vector of each pipeline section in each pipeline; determining a second difference vector of each pipeline section in each pipeline; determining grid size parameters of a numerical simulation analysis method; and the pipe network position acquisition module is used for acquiring the spatial position of the urban underground pipe network based on the grid size parameters of the numerical simulation analysis method. The displacement accuracy of the underground pipe network is improved, and the spatial position of the underground pipe network is obtained more accurately.

Description

Technical Field

[0001] The present application relates to the field of data processing technology, and in particular to an intelligent analysis system for the spatial position of an urban underground pipeline network. Background Art

[0002] With the acceleration of urbanization, urban underground pipeline networks (such as water supply, drainage, gas, electricity, communications, etc.) are becoming increasingly complex. The effective management and maintenance of these pipeline networks have become an important part of urban sustainable development. Real-time and accurate pipeline network data is crucial for disaster prevention and mitigation, emergency response, and optimal resource allocation.

[0003] Creating a digital map of the underground pipeline network can achieve the integration and visualization of spatial data, but foundation pit excavation will cause additional stress and deformation of underground pipelines in the adjacent area. It is necessary to correct the displacement data of the pipeline network to obtain a more accurate spatial position of the pipeline network and modify the digital map. Using numerical simulation analysis methods for overall modeling can effectively analyze the impact of foundation pit excavation on underground pipelines, but the parameter grid size of the numerical simulation analysis method usually adopts a fixed value and cannot be adjusted according to the impact of different situations, which is easy to cause errors. Summary of the invention

[0004] In order to solve the above technical problems, a system for intelligent analysis of the spatial position of an urban underground pipeline network is provided to solve the existing problems.

[0005] The solution to the technical problem of this application is to provide an intelligent analysis system for the spatial position of an urban underground pipe network, the system comprising:

[0006] The data acquisition module is used to collect the length and location information of each pipeline in the underground pipeline network in the vicinity of the foundation pit according to the digital map;

[0007] Model building module for determining mesh size parameters for numerical simulation analysis methods, including:

[0008] (1) According to the difference in distance between different positions in each pipeline and the foundation pit, each pipeline is divided into pipeline segments of different lengths, and each pipeline segment of each pipeline is obtained;

[0009] (2) determining the first difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the pipeline point to which it belongs, and the positional relationship between each pipeline and other pipelines when connected, wherein the pipeline point is a node connecting different pipelines;

[0010] (3) determining a second difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the foundation pit, and the distance between each pipeline segment and the ground;

[0011] (4) determining a grid size parameter of a numerical simulation analysis method based on the first difference vector and the second difference vector;

[0012] The pipeline network location acquisition module is used to obtain the spatial location of the urban underground pipeline network through the grid size parameters of the numerical simulation analysis method.

[0013] Preferably, the method for obtaining each pipeline segment of each pipeline is:

[0014] Get the center position of each pipeline and record it as the pipeline center;

[0015] Cut the pipeline of the same length on both sides from the center of each pipeline, and record it as the central pipeline section of each pipeline;

[0016] Starting from the end point of the central pipeline segment, cut off the undetermined pipeline segment with the same length as the central pipeline segment;

[0017] Obtain the center position of the pipeline segment to be determined, and record it as the center to be determined;

[0018] Analyze the distance difference between the center to be determined and the center of the pipeline and the foundation pit to determine the actual length of the pipeline section to be determined;

[0019] Re-intercept a pipeline segment with the same actual length from the endpoint of the central pipeline segment, and start intercepting a pending pipeline segment with the same length as the central pipeline segment from the endpoint of the re-intercepted pipeline segment, calculate the actual length of each pending pipeline segment, repeat the operation until it moves to the pipe point and stops, divide each pipeline into pipeline segments of different lengths, and obtain each pipeline segment of each pipeline.

[0020] Preferably, determining the actual length of the pipeline segment to be determined includes:

[0021] Calculate the distance between the side of the foundation pit closest to the center to be determined and the center to be determined, and record it as the first distance;

[0022] Calculate the distance between the side of the foundation pit closest to the center of the pipeline and the center of the pipeline, and record it as the second distance;

[0023] Using the ratio of the first distance to the second distance as a length adjustment factor of the pipeline segment to be determined;

[0024] The product of the length adjustment factor and the length of the central pipeline segment is taken as the actual length of the pipeline segment to be determined.

[0025] Preferably, determining the first difference vector of each pipeline segment in each pipeline includes:

[0026] Analyze the distance between the center of each pipeline segment in each pipeline and the pipeline point to which it belongs, and determine the first vector of each pipeline segment in each pipeline;

[0027] Analyze the positional relationship between other pipelines connected to each pipeline and each pipeline segment in the corresponding pipeline, and obtain each connection vector of each pipeline segment in each pipeline;

[0028] Analyze the positional relationship between each connection vector of each pipeline segment and the first vector of the corresponding pipeline segment to determine each connection product vector of each pipeline segment in each pipeline;

[0029] The sum of all the connection product vectors of each pipeline segment in each pipeline is used as the first difference vector of each pipeline segment in each pipeline.

[0030] Preferably, determining the first vector of each pipeline segment in each pipeline includes:

[0031] The reciprocal of the distance between the center of each pipeline segment and the left and right pipe points is taken as a vector, and the direction vector from the center of each pipeline segment in each pipeline to the opposite direction of the left and right pipe points of the pipeline is recorded as the left vector and right vector of each pipeline segment in each pipeline;

[0032] The sum of the left vector and the right vector is used as the first vector of each pipeline segment in each pipeline.

[0033] Preferably, the obtaining of each connection vector of each pipeline segment in each pipeline includes:

[0034] The other pipelines connected to the two pipe points of each pipeline are recorded as each connecting pipeline;

[0035] The length of each connecting pipeline is taken as a vector, and the direction vector pointing from the center position of each connecting pipeline to the center of each pipeline segment is recorded as each connecting vector of each pipeline segment.

[0036] Preferably, determining each connection product vector of each pipeline segment in each pipeline includes:

[0037] Record the sum of each connection vector of each pipeline segment in each pipeline and the first vector of the corresponding pipeline segment as each connection sum vector of each pipeline segment in each pipeline;

[0038] Record the sine value of the angle between each connection vector of each pipeline segment and the first vector of the corresponding pipeline segment as each connection weight of each pipeline segment in each pipeline;

[0039] The product of the connection sum vector and the connection weight is used as each connection product vector of each pipeline segment in each pipeline.

[0040] Preferably, determining the second difference vector of each pipeline segment in each pipeline includes:

[0041] Calculate the distance between the center of each pipeline segment in each pipeline and the ground, and record it as the third distance;

[0042] The second distance is combined with the third distance to determine the influence of the foundation pit of each pipeline segment in each pipeline;

[0043] The influence degree of the foundation pit is taken as the vector size, and the direction vector pointing from the foundation pit to the pipeline and perpendicular to the foundation pit is taken as the second difference vector of the foundation pit of each pipeline segment in each pipeline.

[0044] Preferably, the determining of the grid size parameters of the numerical simulation analysis method comprises:

[0045] Taking the sum vector of the first difference vector and the second difference vector of each pipeline segment in each pipeline as the displacement trend vector of each pipeline segment in each pipeline;

[0046] The normalized result of the inverse of the modulus value of the displacement trend vector of each pipeline segment in each pipeline is used as the grid size parameter of each pipeline segment during the numerical simulation analysis.

[0047] Preferably, the obtaining of the precise spatial position of the urban underground pipe network includes: using a numerical simulation method to obtain the local displacement of the underground pipe network, and correcting the digital map to obtain the spatial position of the underground pipe network.

[0048] This application has at least the following beneficial effects:

[0049] The present application divides each pipeline into pipeline segments according to the difference in distances between different positions in each pipeline and the foundation pit. The beneficial effect of this application is that it can more accurately analyze the degree to which different positions on the pipeline are affected by the foundation pit excavation, so as to better analyze the displacement of the pipeline segments in the future. The first difference vector of each pipeline segment in each pipeline is determined according to the distance between each pipeline segment in each pipeline and the pipe point of the pipeline to which it belongs, and the positional relationship when each pipeline is connected to other pipelines. The beneficial effect of this application is that it takes into account the forces of the pipe points and other pipelines on the pipeline segments at different positions in the pipeline, analyzes the resistance of each pipeline segment, and reflects the resistance of each pipeline segment to the impact of the foundation pit excavation. The first difference vector of each pipeline segment in each pipeline is determined according to the distance between each pipeline segment in each pipeline and the pipe point of the pipeline to which it belongs, and the positional relationship when each pipeline is connected to other pipelines. The beneficial effect of this application is that it takes into account the forces of the pipe points and other pipelines on the pipeline segments at different positions in the pipeline, analyzes the resistance of each pipeline segment, and reflects the resistance of each pipeline segment to the impact of the foundation pit excavation. The distance between the pipeline segment and the foundation pit, as well as the distance between each pipeline segment and the ground, is used to determine the second difference vector of each pipeline segment in each pipeline, which has the beneficial effect of taking into account the degree of influence of the depth of foundation pit excavation on the pipeline; based on the first difference vector and the second difference vector, the displacement trend vector of each pipeline segment in each pipeline is obtained, and the grid size parameters of the numerical simulation analysis method are determined, which has the beneficial effect of taking into account the displacement trend vectors of the pipeline segments at different positions in the pipeline, thereby determining the grid size parameters of the numerical simulation analysis method at different positions, so as to speed up the calculation speed, reduce the required computing resources, obtain a more accurate displacement distance of the underground pipeline network, and obtain a more accurate spatial position of the underground pipeline network. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The following is a further detailed description of an intelligent analysis system for the spatial position of an urban underground pipe network of the present application in conjunction with the accompanying drawings.

[0051] Figure 1 A block diagram of an intelligent analysis system for the spatial location of an urban underground pipe network provided in an embodiment of the present application;

[0052] Figure 2 A flowchart of the steps of the model building module provided in the embodiment of the present application;

[0053] Figure 3 A schematic diagram of the process of dividing each pipeline segment provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of the connection of two underground pipelines provided in an embodiment of the present application;

[0055] Figure 5 A flowchart of the steps of a method for obtaining a first difference vector of each pipeline segment in each pipeline provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of this application more clear, the following is a further detailed description of an urban underground pipe network spatial location intelligent analysis system proposed in this application in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0057] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0058] See also Figure 1 , which shows a block diagram of an intelligent analysis system for the spatial position of an urban underground pipe network provided by an embodiment of the present application. The system includes: a data acquisition module, a model building module, and a pipe network position acquisition module.

[0059] The data acquisition module is used to collect the length and location information of each pipeline in the underground pipeline network in the vicinity of the foundation pit based on the digital map.

[0060] Excavation of foundation pit will cause displacement field of free soil, which will affect underground pipelines in the vicinity of foundation pit. Different distances from foundation pit will affect underground pipelines in the vicinity to different extents. Excavation of foundation pit will cause both lateral and longitudinal displacement of underground pipelines, and the displacement of underground pipelines is also related to their own position and resistance. Therefore, it is necessary to collect relevant data of foundation pit and its vicinity, specifically:

[0061] Through the foundation pit excavation design drawing, the size of the foundation pit, including length, width and depth, is obtained. Taking the foundation pit as the center, an area with a preset radius R is obtained and recorded as the area adjacent to the foundation pit. Through the existing digital map, the underground pipeline location information and the length of the pipeline in the area adjacent to the foundation pit are collected.

[0062] Preferably, in this embodiment, the preset radius R is 10m.

[0063] At this point, the length and location information of each pipeline in the underground pipeline network in the area adjacent to the foundation pit are obtained.

[0064] Model building module used to determine the mesh size parameters for numerical simulation analysis methods.

[0065] Further, the step flow chart of the model construction module provided in the embodiment of the present application is as follows: Figure 2 shown.

[0066] Step 1: According to the difference in distance between different positions in each pipeline and the foundation pit, each pipeline is divided into pipeline segments of different lengths, and each pipeline segment of each pipeline is obtained.

[0067] Because the underground pipe network in the area adjacent to the foundation pit is not evenly distributed, there are intersections between different pipelines. Some pipelines are perpendicular to the edge of the foundation pit, and some pipelines pass through the bottom of the foundation pit. It should be noted that a pipeline is a section of pipe in the underground pipe network, which may be a drainage or gas pipeline. The pipeline center is the length center of a pipeline. The pipe point is the node connecting different pipelines, which may be a branch point, elbow, tee or cross. The underground pipe network needs to be surveyed before excavation, so generally there will be no pipelines in the foundation pit. Therefore, pipelines in the area adjacent to the foundation pit will be affected by the foundation pit. Different positions of a pipeline will be affected differently by the foundation pit, and the degree of pipeline displacement will also be different.

[0068] If we analyze the entire pipeline directly, the displacement of the pipeline will cause a large error. Therefore, we need to analyze each pipeline in sections first, which can effectively reduce the error. Specifically:

[0069] Get the center position of each pipeline and record it as the pipeline center;

[0070] Cut the pipeline of the same length on both sides from the center of each pipeline, and record it as the central pipeline section of each pipeline;

[0071] Starting from the end point of the central pipeline segment, cutting a pipeline segment to be determined with the same length as the central pipeline segment;

[0072] Obtain the center position of the pipeline segment to be determined, and record it as the center to be determined;

[0073] Calculate the distance between the side of the foundation pit closest to the center to be determined and the center to be determined, and record it as the first distance;

[0074] Calculate the distance between the side of the foundation pit closest to the center of the pipeline and the center of the pipeline, and record it as the second distance;

[0075] Using the ratio of the first distance to the second distance as a length adjustment factor of the pipeline segment to be determined;

[0076] The product of the length adjustment factor and the length of the central pipeline segment is used as the actual length of the pipeline segment to be determined;

[0077] Based on the actual length of the pipeline segment to be determined, re-cut the pipeline segment with the same actual length from the end point of the central pipeline segment, and start from the end point of the re-cut pipeline segment to cut the pipeline segment to be determined with the same length as the central pipeline segment, calculate the actual length of each pipeline segment to be determined, repeat the operation until it moves to the pipe point and stops, divide each pipeline into pipeline segments of different lengths, and obtain each pipeline segment of each pipeline;

[0078] It should be noted that if the length of the pipeline segment near the pipe point is less than the length of the central pipeline segment, the pipeline segment of this segment is merged with the previous pipeline segment.

[0079] Preferably, in this embodiment, the length of the central pipeline segment is one twentieth of the length of the pipeline to which it belongs. As other implementation methods, the implementer can set it according to actual conditions; the first distance is calculated by calculating the Euclidean distance between the undetermined center of each initial pipeline segment and the foundation pit, and the second distance is calculated by calculating the Euclidean distance between the pipeline center of the central pipeline segment and the foundation pit.

[0080] It is understandable that this embodiment only provides a method for measuring distance, namely, Euclidean distance. As other implementation methods, implementers may adopt other methods, such as Manhattan distance, etc. This embodiment does not impose any special restrictions on this.

[0081] Furthermore, the schematic diagram of the process of dividing each pipeline segment provided in this embodiment is as follows: Figure 3 As shown, in pipeline AB, a0 is the center of the pipeline, b1b2 is the central pipeline segment, starting from the right end point b2 of the central pipeline segment b1b2, b2b3 of the same length as b1b2 is intercepted as the pipeline segment to be determined, a2 is the pending center of the pending pipeline segment b2b3, the actual length of the pending pipeline segment b2b3 is calculated, and the pipeline segment b2c1 with the same actual length is intercepted, starting from the right end point c1 of the pipeline segment b2c1, c1b4 of the same length as b1b2 is intercepted as the pipeline segment to be determined, a3 is the pending center of the pending pipeline segment c1b4, the actual length of the pending pipeline segment c1b4 is calculated, and the pipeline segment c1c2 with the same actual length is intercepted until reaching the pipeline point B, and the left side of the central pipeline segment b1b2 adopts the same method as the right side, and finally the pipeline AB is divided into pipeline segments of different lengths.

[0082] It should be noted that the actual length reflects the degree to which each pipeline section is affected by the foundation pit excavation. The larger the actual length, the longer the pipeline section is, the smaller the impact of the foundation pit excavation is, and the smaller the displacement caused is; conversely, the greater the impact is, the greater the displacement caused.

[0083] At this point, each pipeline segment of each pipeline is obtained.

[0084] Step 2: determine the first difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the pipeline point to which it belongs, and the positional relationship when each pipeline is connected to other pipelines.

[0085] Furthermore, since different pipelines are connected by various pipe points, the pipeline segments close to the pipe points will be supported by the pipe points and can resist a certain degree of displacement, so the pipeline segments closer to the pipe points will be subject to greater resistance. Therefore, according to the positional relationship between the pipeline segments and the pipe points, as well as other pipelines connected to the pipe points, the resistance vectors of each pipeline segment are analyzed, specifically:

[0086] The reciprocal of the distance between the center of each pipeline segment and the left and right pipe points is taken as a vector, and the direction vector from the center of each pipeline segment in each pipeline to the opposite direction of the left and right pipe points of the pipeline is recorded as the left vector and right vector of each pipeline segment in each pipeline;

[0087] The sum of the left vector and the right vector is used as the first vector of each pipeline segment in each pipeline;

[0088] In this embodiment, the first vector is: in, is the first vector of the i-th pipeline segment in the k-th pipeline, is the Euclidean distance between the center of the i-th pipeline segment and the left end point in the k-th pipeline, is the Euclidean distance between the center of the i-th pipeline segment in the k-th pipeline and the right end point, is the left vector of the i-th pipeline segment in the k-th pipeline, is the right vector of the i-th pipeline segment in the k-th pipeline.

[0089] It should be noted that since the resistance forces exerted on the central pipeline segment by the pipe points at both ends are of the same magnitude and opposite direction, the resistance forces cancel each other out and the magnitude of the first vector of the central pipeline segment is zero; secondly, the first vector reflects the magnitude of the resistance forces exerted on the pipeline segment by the pipe points.

[0090] Furthermore, each pipeline segment is subject to the resistance of the pipe points at both ends of the pipeline connected to it, as well as the resistance of other pipelines connected to the pipe points. Therefore, it is necessary to analyze the resistance of other pipelines connected to the pipe points to each pipeline segment, specifically:

[0091] The other pipelines connected to the two pipe points of each pipeline are recorded as each connecting pipeline;

[0092] The length of each connecting pipeline is taken as a vector, and the direction vector pointing from the center position of each connecting pipeline to the center of each pipeline segment is recorded as each connecting vector of each pipeline segment;

[0093] Record the sum of each connection vector of each pipeline segment in each pipeline and the first vector of the corresponding pipeline segment as each connection sum vector of each pipeline segment in each pipeline;

[0094] Record the sine value of the angle between each connection vector of each pipeline segment and the first vector of the corresponding pipeline segment as each connection weight of each pipeline segment in each pipeline;

[0095] The product of the connection sum vector and the connection weight is recorded as each connection product vector of each pipeline segment in each pipeline;

[0096] The sum of all the connection product vectors of each pipeline segment in each pipeline is used as the first difference vector of each pipeline segment in each pipeline;

[0097] In this embodiment, the first difference vector is: in, is the first difference vector of the i-th pipeline segment in the k-th pipeline, is the first vector of the i-th pipeline segment in the k-th pipeline, is the rth connection vector of the i-th pipeline segment in the k-th pipeline, E k,r is the center of the rth connected pipeline of the i-th pipeline segment in the k-th pipeline, E k,i is the center of the i-th pipeline segment in the k-th pipeline, sin< is the rth connection weight of the i-th pipeline segment in the k-th pipeline, is the rth connection sum vector of the i-th pipeline segment in the k-th pipeline, is the rth connection product vector of the ith pipeline segment in the kth pipeline, and R is the number of other pipelines connected to the kth pipeline.

[0098] It should be noted that when the angle between the connecting pipeline and the pipeline segment is ninety degrees, the resistance borne by each pipeline segment is the largest; each connection vector reflects the resistance of other pipelines connected to the pipe point of the pipeline where the pipeline segment is located to its pipeline segment; secondly, the first difference vector represents the resistance of each pipeline segment to the impact of foundation pit excavation. The larger the first difference vector, the greater the resistance of the pipeline segment. Under the same conditions, the less the pipeline segment is affected by the foundation pit excavation, and the smaller the displacement caused; otherwise, the greater the displacement.

[0099] Further, the connection diagram of two underground pipelines provided in the embodiment of the present application is as follows: Figure 4 As shown, AB is a pipeline, BC is a connecting pipeline, MN is the pipeline segment in pipeline AB, E is the center of pipeline segment MN, D is the center of pipeline BC, EF is the first vector of pipeline segment MN, DH is the connecting vector of pipeline segment MN, and the length of DH is equal to the length of BC.

[0100] Furthermore, the flowchart of the steps of the method for obtaining the first difference vector of each pipeline segment in each pipeline provided in the embodiment of the present application is as follows: Figure 5 shown.

[0101] At this point, the first difference vector of each pipeline segment in each pipeline is obtained.

[0102] Step 3: Determine the second difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the foundation pit, and the distance between each pipeline segment and the ground.

[0103] The displacement of the pipeline is related to the soil settlement area caused by the foundation pit excavation. When the foundation pit is shallow, the closer to the foundation pit, the greater the displacement of the free soil. As the excavation depth of the foundation pit increases, the closer to the foundation pit, the smaller the displacement of the free soil. The greater the soil displacement, the greater the corresponding displacement force of the pipeline. Therefore, at the same distance from the edge of the foundation pit, the deeper the foundation pit, that is, the farther the pipeline is from the ground, the underground pipeline is affected by the foundation pit excavation, and the smaller the degree of pipeline displacement caused.

[0104] Based on the above analysis, the influence of the distance and excavation depth of the foundation pit on the pipeline is analyzed, and the foundation pit influence vector is determined, which is:

[0105] Calculate the distance between the center of each pipeline segment in each pipeline and the ground, and record it as the third distance;

[0106] The second distance is combined with the third distance to determine the influence of the foundation pit of each pipeline segment in each pipeline;

[0107] It is understandable that the fusion can be expressed as a multiplication relationship, an addition relationship, etc., which is determined by the actual application and the present application does not impose any special restrictions on this.

[0108] Taking the influence degree of the foundation pit as the vector magnitude and the direction vector that points from the foundation pit to the pipeline and is perpendicular to the foundation pit as the direction, as the second difference vector of each pipeline segment in each pipeline;

[0109] Preferably, in this embodiment, the Euclidean distance between the center of each pipeline segment in each pipeline and the ground is calculated as the third distance; the product of the second distance and the third distance is used as the foundation pit influence degree of each pipeline segment in each pipeline.

[0110] It should be noted that the influence of the foundation pit on each pipeline segment is affected by two distances. The greater the influence of the foundation pit on each pipeline segment, the greater the impact of the foundation pit excavation on each pipeline segment and the greater the displacement caused. On the contrary, the displacement of the pipeline segment caused by the foundation pit excavation is smaller.

[0111] At this point, the second difference vector of each pipeline segment in each pipeline is obtained.

[0112] Step 4: Determine a grid size parameter of a numerical simulation analysis method based on the first difference vector and the second difference vector.

[0113] The displacement of pipelines is caused by the influence of foundation pit on pipelines, and the influence of pipelines in different positions on foundation pit excavation has different resistance due to the support between pipelines. The second difference vector and the first difference vector of each pipeline segment in each pipeline are obtained, and the displacement trend of pipeline segments is finally determined, which is as follows:

[0114] Taking the sum vector of the first difference vector and the second difference vector of each pipeline segment in each pipeline as the displacement trend vector of each pipeline segment in each pipeline;

[0115] It should be noted that the displacement trend vector reflects the displacement of the pipeline segment under the influence of foundation pit excavation. The direction of the displacement trend vector is the direction of displacement of each pipeline segment. The magnitude of the displacement trend vector is the degree of displacement of the pipeline segment. The larger the value of the displacement trend vector, the greater the impact of the foundation pit excavation on the pipeline segment.

[0116] Based on the above analysis, when the displacement of underground pipelines is analyzed by numerical simulation, the grid size is a key parameter. A smaller grid size can provide higher analysis accuracy and help better capture local features, especially in areas with large stress or displacement. Setting a smaller grid size can better capture the details or complex geometric features of the displacement field. However, as the grid size decreases, the numerical solution tends to converge, and more iteration steps may be required to reach the convergence standard. In addition, a smaller grid size will increase the number of elements and nodes, thereby increasing the amount of calculation and memory requirements, which may lead to a significant increase in computational costs. Therefore, it is necessary to determine the displacement trend according to the location of underground pipelines in different foundation pits and their adjacent areas, and adjust the grid size to obtain more accurate simulation results to reflect the changes in the location space of the underground pipeline network. Therefore, the model parameters in the numerical simulation analysis process are collected, including the elastic modulus, Poisson's ratio and density of the foundation pit soil, the elastic modulus and Poisson's ratio of the pipeline, and the type and layout of the foundation pit support structure.

[0117] Furthermore, when using numerical simulation for analysis, the larger the displacement trend vector value of each pipeline segment in each pipeline, the smaller the grid size should be, so as to capture more detailed details and simulate the displacement and deformation of the pipeline segment more finely; the smaller the displacement trend vector value of each pipeline segment in each pipeline, the larger the grid size should be, so as to reduce the amount of calculation. Therefore, based on the displacement trend vector, the grid size parameters of the numerical simulation analysis method are determined, specifically:

[0118] The normalized result of the inverse of the modulus value of the displacement trend vector of each pipeline segment in each pipeline is used as the grid size parameter of each pipeline segment when performing numerical simulation analysis;

[0119] Preferably, in this embodiment, the finite element analysis method is used for numerical simulation. As other implementation methods, the implementer may use other methods, such as boundary element method, finite difference method, etc. for numerical simulation, and this embodiment does not impose any special restrictions on this.

[0120] The pipeline network location acquisition module is used to obtain the spatial location of the urban underground pipeline network through the grid size parameters of the numerical simulation analysis method.

[0121] Furthermore, based on the grid size parameters of the numerical simulation analysis method, the precise location of the urban underground pipeline network is obtained, specifically:

[0122] The local displacement of underground pipe network is obtained by numerical simulation method;

[0123] The digital map of the urban underground pipeline network is corrected in time based on the local displacement of the underground pipeline network to obtain a more accurate spatial position of the pipeline network.

[0124] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0125] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the present application. It should be pointed out that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the content of the technical solution of the present application, shall fall within the protection scope of the technical solution of the present application.

Claims

1. An intelligent analysis system for the spatial position of an urban underground pipe network, characterized in that: The system comprises: The data acquisition module is used to collect the length and location information of each pipeline in the underground pipeline network in the vicinity of the foundation pit according to the digital map; Model building module for determining mesh size parameters for numerical simulation analysis methods, including: (1) According to the difference in distance between different positions in each pipeline and the foundation pit, each pipeline is divided into pipeline segments of different lengths, and each pipeline segment of each pipeline is obtained; (2) determining the first difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the pipeline point to which it belongs, and the positional relationship between each pipeline and other pipelines when connected, wherein the pipeline point is a node connecting different pipelines; (3) determining a second difference vector of each pipeline segment in each pipeline according to the distance between each pipeline segment in each pipeline and the foundation pit, and the distance between each pipeline segment and the ground; (4) determining a grid size parameter of a numerical simulation analysis method based on the first difference vector and the second difference vector; The pipeline network location acquisition module is used to obtain the spatial location of the urban underground pipeline network through the grid size parameters of the numerical simulation analysis method.

2. The urban underground pipe network spatial position intelligent analysis system according to claim 1, characterized in that: The method for obtaining each pipeline segment of each pipeline is as follows: Get the center position of each pipeline and record it as the pipeline center; Cut the pipeline of the same length on both sides from the center of each pipeline, and record it as the central pipeline section of each pipeline; Starting from the end point of the central pipeline segment, cut off the undetermined pipeline segment with the same length as the central pipeline segment; Obtain the center position of the pipeline segment to be determined, and record it as the center to be determined; Analyze the distance difference between the center to be determined and the center of the pipeline and the foundation pit to determine the actual length of the pipeline section to be determined; Re-intercept a pipeline segment with the same actual length from the endpoint of the central pipeline segment, and start intercepting a pending pipeline segment with the same length as the central pipeline segment from the endpoint of the re-intercepted pipeline segment, calculate the actual length of each pending pipeline segment, repeat the operation until it moves to the pipe point and stops, divide each pipeline into pipeline segments of different lengths, and obtain each pipeline segment of each pipeline.

3. The urban underground pipe network spatial position intelligent analysis system according to claim 2, characterized in that: Determining the actual length of the pipeline segment to be determined includes: Calculate the distance between the side of the foundation pit closest to the center to be determined and the center to be determined, and record it as the first distance; Calculate the distance between the side of the foundation pit closest to the center of the pipeline and the center of the pipeline, and record it as the second distance; Using the ratio of the first distance to the second distance as a length adjustment factor of the pipeline segment to be determined; The product of the length adjustment factor and the length of the central pipeline segment is taken as the actual length of the pipeline segment to be determined.

4. The urban underground pipe network spatial position intelligent analysis system according to claim 1, characterized in that: The determining of the first difference vector of each pipeline segment in each pipeline includes: Analyze the distance between the center of each pipeline segment in each pipeline and the pipeline point to which it belongs, and determine the first vector of each pipeline segment in each pipeline; Analyze the positional relationship between other pipelines connected to each pipeline and each pipeline segment in the corresponding pipeline, and obtain each connection vector of each pipeline segment in each pipeline; Analyze the positional relationship between each connection vector of each pipeline segment and the first vector of the corresponding pipeline segment to determine each connection product vector of each pipeline segment in each pipeline; The sum of all the connection product vectors of each pipeline segment in each pipeline is used as the first difference vector of each pipeline segment in each pipeline.

5. The urban underground pipe network spatial position intelligent analysis system according to claim 4, characterized in that: Determining the first vector of each pipeline segment in each pipeline includes: The reciprocal of the distance between the center of each pipeline segment and the left and right pipe points is taken as a vector, and the direction vector from the center of each pipeline segment in each pipeline to the opposite direction of the left and right pipe points of the pipeline is recorded as the left vector and right vector of each pipeline segment in each pipeline; The sum of the left vector and the right vector is used as the first vector of each pipeline segment in each pipeline.

6. The urban underground pipe network spatial position intelligent analysis system according to claim 4, characterized in that: The obtaining of each connection vector of each pipeline segment in each pipeline includes: The other pipelines connected to the two pipe points of each pipeline are recorded as each connecting pipeline; The length of each connecting pipeline is taken as a vector, and the direction vector pointing from the center position of each connecting pipeline to the center of each pipeline segment is recorded as each connecting vector of each pipeline segment.

7. The urban underground pipe network spatial position intelligent analysis system according to claim 4, characterized in that: Determining each connection product vector of each pipeline segment in each pipeline includes: Record the sum of each connection vector of each pipeline segment in each pipeline and the first vector of the corresponding pipeline segment as each connection sum vector of each pipeline segment in each pipeline; Record the sine value of the angle between each connection vector of each pipeline segment and the first vector of the corresponding pipeline segment as each connection weight of each pipeline segment in each pipeline; The product of the connection sum vector and the connection weight is used as each connection product vector of each pipeline segment in each pipeline.

8. The urban underground pipe network spatial position intelligent analysis system according to claim 3, characterized in that: The determining of the second difference vector of each pipeline segment in each pipeline includes: Calculate the distance between the center of each pipeline segment in each pipeline and the ground, and record it as the third distance; The second distance is combined with the third distance to determine the influence of the foundation pit of each pipeline segment in each pipeline; The influence degree of the foundation pit is taken as the vector size, and the direction vector pointing from the foundation pit to the pipeline and perpendicular to the foundation pit is taken as the second difference vector of the foundation pit of each pipeline segment in each pipeline.

9. The urban underground pipe network spatial position intelligent analysis system according to claim 1, characterized in that: The method of determining the mesh size parameters of the numerical simulation analysis method comprises: Taking the sum vector of the first difference vector and the second difference vector of each pipeline segment in each pipeline as the displacement trend vector of each pipeline segment in each pipeline; The normalized result of the inverse of the modulus value of the displacement trend vector of each pipeline segment in each pipeline is used as the grid size parameter of each pipeline segment during the numerical simulation analysis.

10. The urban underground pipe network spatial position intelligent analysis system according to claim 1, characterized in that: The method of obtaining the precise spatial position of the urban underground pipe network includes: using a numerical simulation method to obtain the local displacement of the underground pipe network, and correcting the digital map to obtain the spatial position of the underground pipe network.

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