Subway station platform layer building limit range graph drawing method and device based on CAD

Abstract

The invention provides a method and a device for drawing a subway station platform layer building limit range graph based on CAD (Computer Aided Design), and relates to the technical field of data processing.The method comprises the following steps: acquiring a line center line entity object of a subway station platform layer, dividing the building clearance area into an effective platform range, an effective platform outer corridor range and a side wall range based on the line center line; according to preset vehicle model parameters and area types, the building limit reference value of each area is obtained, the dynamic widening amount is obtained by combining the larger value of the curve widening amount and the turnout widening amount, and the total building limit value is the sum of the reference value and the dynamic widening amount. According to the invention, the automatic and high-precision generation of the limit diagram is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of urban rail transit civil engineering design and digital drawing, and in particular to a method and device for drawing a building boundary range diagram of a subway station platform layer based on CAD. Background Art

[0002] In the design of subway station platforms, accurate drawing of building clearance range is a key link to ensure the safety of train operation and the rationality of platform facility layout. Building clearance specifies the minimum safe distance between vehicles and platform structures and equipment. Its range needs to be dynamically adjusted according to vehicle parameters, line geometry (such as curve radius, turnout layout) and engineering specifications. However, the traditional design method currently used in the industry has the following significant problems: the existing technology relies on designers to manually operate CAD software to calculate the clearance of effective platforms, external corridors, side walls and other areas one by one. The limit reference value is calculated and adjusted in sections according to the widening requirements of the curve section and switch area. The widening amount of complex curves (such as transition curves) needs to be calculated in sections according to the specifications. Manual processing is time-consuming and easy to miss key control points. The limit drawing of the curve section mostly adopts the straight line approximation method, ignoring the gradual change characteristics of the widening amount in different sections of the transition curve (from the widening starting point to the half-widening point, and from the half-widening point to the full-widening point), resulting in limit range deviation. For example, a straight line connecting the half-widening point and the full-widening point will cause the inner limit to be too large or the outer limit to be too small due to the change in curve radius, which requires additional manual correction.

[0003] The limit design of the turnout area relies on empirical values ​​or fixed templates, which makes it difficult to adapt to the combination of different turnout types (such as single-opening turnouts and crossing turnouts) and vehicle parameters. This easily leads to the problem of the limit range not matching the actual operating conditions. When the design parameters (such as vehicle type replacement, curve radius adjustment) change, the limit diagram needs to be manually recalculated and modified. The lack of automated tools to support parameter linkage updates leads to long design iteration cycles and high costs. Different designers' understanding of the specifications may lead to inconsistent limit value calculations. For example, the specific requirements for curve widening in the "Metro Design Specifications" and "Metro Limit Standards" must be strictly followed, and manual operation is prone to omissions of key clauses. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and device for drawing a building boundary range diagram of a subway station platform layer based on CAD, thereby realizing the automatic and high-precision generation of the boundary diagram.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] In a first aspect, a method for drawing a building boundary range diagram of a subway station platform layer based on CAD is provided, the method comprising:

[0007] S1: Obtain the line centerline entity object of the subway station platform layer, and divide the building limit area into the effective platform range, the effective platform corridor range and the side wall range based on the line centerline;

[0008] S2: Based on the preset vehicle model parameters and area type, a building clearance reference value is obtained for each area, and the larger value of the curve widening amount and the turnout widening amount is combined to obtain a dynamic widening amount, wherein the total building clearance value is the sum of the reference value and the dynamic widening amount;

[0009] S3: Based on the total building limit value, the coordinates of the projection point are offset in the direction perpendicular to the line centerline to obtain the straight segment building limit range line;

[0010] S4: Based on the straight segment construction clearance line, connect the offset coordinates of the widening start point and the half-widening point with a straight line to obtain a preliminary clearance line. Select multiple sampling points evenly along the line centerline, calculate the coordinates of each point after vertical offset, and obtain a polyline to correct the straight line deviation. Traverse each point on the line centerline and obtain a continuous clearance line based on the vertical offset.

[0011] S5: Based on the continuous clearance range line, the vehicle type parameters and the widening reference value of the turnout combination in the pre-stored database are called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand, and the construction clearance range line of the turnout area is automatically obtained;

[0012] S6: Based on the straight segment building limit range line, continuous limit range line and switch area building limit range line, the calculation results are automatically drawn as a building limit range diagram through the CAD interface.

[0013] Furthermore, a line centerline entity object of the subway station platform layer is obtained, and the building limit area is divided into an effective platform range, an effective platform corridor range, and a side wall range based on the line centerline, including:

[0014] S1.1: Use CAD software to extract the line centerline entity objects in the subway station platform design drawing;

[0015] S1.2: Based on the centerline entity object, the geometric characteristics of the line centerline and the preset area division rules, the building limit area is divided into the effective platform range, the effective platform corridor range, the effective platform outer wall range and the station outer wall range.

[0016] Furthermore, based on the preset vehicle type parameters and area type, a building clearance reference value for each area is obtained, and the larger value of the curve widening amount and the turnout widening amount is combined to obtain a dynamic widening amount, wherein the total building clearance value is the sum of the reference value and the dynamic widening amount, including:

[0017] S2.1: Based on the division results of the effective platform range, effective platform corridor range, effective platform outer wall range, and station outer wall range, the corresponding building clearance reference values ​​are matched according to the preset vehicle model parameters and area type;

[0018] S2.2: Based on the building clearance reference value, calculate the curve widening amount and turnout widening amount for the curve section and turnout area respectively, and take the larger value of the two as the dynamic widening amount;

[0019] S2.3: Add the dynamic widening amount to the building clearance reference value to obtain the total building clearance value for each area.

[0020] Furthermore, based on the total building clearance value, the coordinates of the projection point are offset in the direction perpendicular to the line centerline to obtain the straight segment building clearance range line, including:

[0021] S3.1: Based on the total building clearance, select multiple projection points on the line centerline. The projection points include the starting point, end point, and midpoint of the platform edge at the preset intervals.

[0022] S3.2: Bidirectionally offset each projection point in the direction perpendicular to the line centerline. The offset amount is the total building limit value of the corresponding area to obtain the inner and outer building limit range line control points;

[0023] S3.3: Connect the control points according to the area type. Within the valid platform range, directly connect the control points of the starting point and the end point to form a straight line segment building limit range line. Within the valid platform corridor range and side wall range, connect the control points at preset intervals in sequence to form a continuous straight line segment.

[0024] S3.4: Based on the obtained continuous straight line segments, automatically draw closed or continuous limit range lines using CAD drawing tools and mark the limit value parameters.

[0025] Furthermore, based on the straight segment construction clearance line, the offset coordinates of the widening starting point and the half-widening point are connected with a straight line to obtain a preliminary clearance line. Multiple sampling points are evenly selected along the line centerline, and the coordinates of each point after vertical offset are calculated to obtain a polyline to correct the straight line deviation. Each point on the line centerline is traversed, and a continuous clearance line is obtained based on the vertical offset, including:

[0026] S4.1: Connect the offset coordinates of the widening starting point and the half-widening point with a straight line to obtain the preliminary limit line;

[0027] S4.2: Based on the preliminary limit line, select multiple sampling points evenly along the line centerline from the widening start point to the half-widening point, and calculate the coordinates of each sampling point after the total construction limit value is offset perpendicular to the line centerline;

[0028] S4.3: Based on the offset coordinates of the sampling points, replace the preliminary limit line with a polyline consisting of multiple continuous line segments to correct the limit range deviation caused by the straight line connection;

[0029] S4.4: Based on the limit range deviation, by traversing each point on the line centerline, dynamically calculate and vertically offset to generate continuous limit range line control points, and automatically connect all control points using CAD drawing tools to form a smooth and closed limit range line.

[0030] Furthermore, based on the continuous clearance range line, the vehicle type parameters and the widening reference value of the turnout combination in the pre-stored database are called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand, and the construction clearance range line of the turnout area is automatically obtained, including:

[0031] S5.1: Based on the vehicle model parameters and turnout type of the current line, call the associated widening reference value and turnout area limit rules stored in the pre-stored database;

[0032] S5.2: Based on the associated widening reference value and the turnout area boundary rules, interactively select the turnout center, the front end point of the straight strand, and the end point of the side strand through the CAD interface to determine the geometric direction and layout relationship of the turnout;

[0033] S5.3: Calculate the total construction clearance value of the turnout area based on the widening reference value, turnout parameters, and vehicle dynamic envelope;

[0034] S5.4: The total construction limit value of the turnout area is passed through the turnout straight and side strands. With the vertical line centerline as the reference, the control points of the inner and outer construction limit range lines of the turnout area are generated according to the total construction limit value offset. The control points are automatically connected by CAD tools to form a closed limit range line.

[0035] Furthermore, the calculation results are automatically drawn into a building clearance range diagram through the CAD interface based on the straight segment building clearance range line, the continuous clearance range line and the switch area building clearance range line, including:

[0036] S6.1: Integrate the coordinates of the control points of the limit lines of each area, verify the closure, continuity and compliance with engineering specifications, and obtain the integrated results;

[0037] S6.2: Based on the integrated result, call a drawing command through the API interface of the CAD software to automatically convert the control point coordinates into a closed or continuous limit range line entity;

[0038] S6.3: Through the limit range line entity, different layers are assigned according to the area type, and the corresponding limit value, widening parameter and area identification are automatically marked;

[0039] S6.4: Obtain the final building clearance range drawing file based on the marked corresponding limit values, widening parameters, and area identification, associate it with the design parameter database, and store it in an editable CAD format file.

[0040] Secondly, a CAD-based device for drawing building boundary range diagrams of subway station platforms includes:

[0041] An acquisition module is configured to obtain a line centerline entity object at the platform level of a subway station, and divide the building clearance area into an effective platform range, an effective platform corridor range, and a side wall range based on the line centerline; obtain a building clearance reference value for each area based on preset vehicle type parameters and area type, and obtain a dynamic widening value by combining the larger value of the curve widening value and the turnout widening value, where the total building clearance value is the sum of the reference value and the dynamic widening value;

[0042] The generation module is used to obtain the straight segment construction clearance range line by offsetting the coordinates of the projection points in the direction perpendicular to the line centerline based on the total construction clearance value; based on the straight segment construction clearance range line, the offset coordinates of the widening starting point and the semi-widening point are connected with a straight line to generate a preliminary clearance line, and multiple sampling points are evenly selected along the line centerline. The coordinates of each point after vertical offset are calculated, and a polyline is generated to correct the straight line deviation. The points on the line centerline are traversed to obtain a continuous clearance range line based on the vertical offset; based on the continuous clearance range line, the widening reference value of the vehicle type parameters and turnout combination in the pre-stored database is called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand, and the end point of the side strand to automatically obtain the construction clearance range line of the turnout area;

[0043] The processing module is used to automatically draw the calculation results into a building limit range diagram through a CAD interface based on the straight segment building limit range line, the continuous limit range line and the switch area building limit range line.

[0044] According to a third aspect, a computing device includes:

[0045] one or more processors;

[0046] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method.

[0047] In a fourth aspect, a computer-readable storage medium stores a program, which implements the method when executed by a processor.

[0048] The above solution of the present invention includes at least the following beneficial effects:

[0049] Through the deep integration of digital technology and specification-driven development, the automated and high-precision drawing of the building limit range diagram at the platform level of subway stations has been achieved, improving design efficiency and accuracy. By dynamically calculating the line centerline reference value, segmented correction of curve widening deviations, intelligent adaptation of switch area parameters, and the automated drawing function of the CAD interface, problems such as low efficiency, large errors, and difficulty in dynamic adjustment in traditional manual drawing have been solved. This method shortens the drawing time of the limit diagram, controls the curve section deviation within plus or minus 3mm, improves the first-time pass rate of the switch area design, and ensures design compliance through real-time specification verification, greatly reducing the risk of manual omissions, and providing reliable technical support for the intelligent design and safe operation of urban rail transit. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 The present invention provides a flow chart of a method for drawing a building boundary range diagram of a subway station platform layer based on CAD.

[0051] Figure 2 The present invention is a schematic diagram of a device for drawing a building boundary range diagram of a subway station platform layer based on CAD provided in an embodiment of the present invention.

[0052] Figure 3 It is a schematic diagram of calculating the widening amount of curved building limits within the effective platform range of the present invention.

[0053] Figure 4 It is a schematic diagram of adjustment parameters for widening the curved building clearance outside the effective platform range of the present invention.

[0054] Figure 5 This is a schematic diagram showing the straight line expression principle of the building limit from the widening starting point to the half-widening point of the present invention.

[0055] Figure 6 This is a comparison diagram of the deviation between the building limit straight line and the polyline from the half-widening point to the full-widening point of the present invention. DETAILED DESCRIPTION

[0056] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0057] like Figure 1 As shown, an embodiment of the present invention proposes a method for drawing a building boundary range diagram of a subway station platform layer based on CAD, and the method includes the following steps:

[0058] Step S1: Obtain the line centerline entity object of the subway station platform layer, and divide the building limit area into the effective platform range, the effective platform corridor range and the side wall range based on the line centerline;

[0059] Step S2: Based on the preset vehicle type parameters and area type, a building clearance reference value is obtained for each area, and the larger value of the curve widening amount and the turnout widening amount is combined to obtain a dynamic widening amount, where the total building clearance value is the sum of the reference value and the dynamic widening amount;

[0060] Step S3: Based on the total building clearance value, the coordinates of the projection point are offset in the direction perpendicular to the line centerline to obtain the straight line segment building clearance range line;

[0061] Step S4: Based on the straight segment building clearance line, the offset coordinates of the widening starting point and the half-widening point are connected with a straight line to obtain a preliminary clearance line. Multiple sampling points are evenly selected along the line centerline, and the coordinates of each point after vertical offset are calculated to obtain a polyline to correct the straight line deviation. Each point on the line centerline is traversed to obtain a continuous clearance line based on the vertical offset.

[0062] Step S5: Based on the continuous clearance range line, the widening reference value of the vehicle type parameters and the turnout combination in the pre-stored database is called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand, so as to automatically obtain the construction clearance range line of the turnout area;

[0063] Step S6: Based on the straight segment building clearance range line, the continuous clearance range line and the switch area building clearance range line, the calculation results are automatically drawn into a building clearance range diagram through the CAD interface.

[0064] In the embodiment of the present invention, through the intelligent division of the line centerline, the precise calculation of the dynamic widening amount (the larger value is taken for curves and switches), the multi-segment line correction technology and the parametric drive of the switch area, the automation and high-precision drawing of the subway platform level limit diagram are realized. Compared with the traditional manual method, the design efficiency is improved, the limit deviation of the curve section is reduced from plus or minus 15 mm to plus or minus 3 mm, and the first-time pass rate of the switch area design is improved. At the same time, through the real-time drawing and specification verification of the CAD interface, the closure, continuity and compliance of the limit range line are ensured, which significantly reduces the risk of manual intervention and omissions, and provides an efficient and reliable design solution for complex lines and dynamic parameter scenarios.

[0065] In a preferred embodiment of the present invention, the above step S1 may include:

[0066] S1.1: Use CAD software to extract the line centerline entity objects in the subway station platform design drawing;

[0067] S1.2: Based on the centerline entity object, the geometric characteristics of the line centerline and the preset area division rules, the building limit area is divided into the effective platform range, the effective platform corridor range, the effective platform outer wall range and the station outer wall range.

[0068] In an embodiment of the present invention, the line centerline entity object is automatically extracted through CAD software, and the intelligent division of the building limit area (including the effective platform, outer corridor, outer wall and the outer wall range of the station) is realized based on geometric features and preset rules, thereby improving the accuracy and efficiency of the area division. This method avoids the subjective errors of traditional manual extraction and division, ensures the strict matching of the limit range with the line geometric features, and supports multi-area collaborative design, enhances the design standardization and consistency, and reduces the safety risks caused by human omissions.

[0069] In an embodiment of the present invention, the specific steps include:

[0070] S1.1: Start the object capture and entity query functions of CAD, accurately locate and extract the line centerline entity objects (such as polylines, spline curves, etc.), ensure that the centerline contains complete geometric information (coordinates, curvature radius, turning points, etc.), and use geometric feature analysis to perform segmented analysis on the extracted line centerline, identify key geometric elements, continuous line segments with infinite curvature radius, including transition curves and circular curves, record parameters such as curvature radius and transition curve length, identify the switch center coordinates, the direction of straight and side strands, and determine the switch type (such as single turnout, crossover).

[0071] S1.2: Based on the spatial position of the line centerline and the functional layout of the station, the building clearance area is divided according to the following rules. The effective platform range is divided based on the projection interval of the platform edge starting point and end point on the line centerline. It corresponds to the passenger boarding and alighting core area specified in the "Metro Design Code" and is directly related to the safe distance between the platform edge and the vehicle. The effective platform corridor range is located outside the effective platform at both ends, adjacent to the platform but not in the direct passenger activity area (such as equipment passages and staircase connecting sections). The range extends from the platform edge end point to the side wall or equipment room boundary. The width is determined according to the station building design parameters. The effective platform outer wall range is further subdivided into: on the side close to the line centerline, space for equipment pipeline installation must be reserved, and the limit reference value must take into account the pipeline layout size; on the side away from the line centerline, the limit reference value only needs to meet the structural safety and vehicle running clearance. The outermost area of ​​the station outer wall range corresponds to the outer wall of the station main structure. The limit reference value is combined with the station external enclosure structure design specifications to ensure a safe distance from external structures.

[0072] In a preferred embodiment of the present invention, the above step S2 may include:

[0073] S2.1: Based on the division results of the effective platform range, effective platform corridor range, effective platform outer wall range, and station outer wall range, the corresponding building clearance reference values ​​are matched according to the preset vehicle model parameters and area type;

[0074] S2.2: Based on the building clearance reference value, calculate the curve widening amount and turnout widening amount for the curve section and turnout area respectively, and take the larger value of the two as the dynamic widening amount;

[0075] S2.3: Add the dynamic widening amount to the building clearance reference value to obtain the total building clearance value for each area.

[0076] In an embodiment of the present invention, the building limit reference value is accurately matched with the area division result and the vehicle type parameters to ensure that the basic safety distance of different functional areas meets the regulatory requirements and avoid the arbitrariness of manual value selection. The widening amount is calculated separately for the curve section and the switch area, and the larger value is taken as the dynamic widening amount, effectively covering the maximum safety margin under complex line conditions, solving the problem of insufficient or redundancy of limits caused by a single widening calculation in the traditional method, and superimposing the dynamic widening amount with the reference value to obtain the total building limit value, realizing the automatic dynamic adjustment of the limit value with the line geometric characteristics (curve radius, switch type) and vehicle type parameters, which not only ensures the safety of subway vehicle operation, but also avoids the waste of resources caused by over-design, and improves the accuracy, efficiency and engineering adaptability of the building limit value calculation.

[0077] In an embodiment of the present invention, the specific steps include:

[0078] S2.1: Based on the four areas divided in S1 (effective platform range, effective platform corridor range, effective platform outer wall range, and station outer wall range), the boundary coordinates and attribute labels of each area (such as effective platform, outer corridor, etc.) are extracted. The functional type of each area is automatically identified through the layer information of the CAD design drawing or the preset naming rules. The vehicle model parameters are retrieved from the design documents or system configuration to obtain the vehicle model used by the current subway line (such as Type A and Type B). Key parameters are extracted, including vehicle width W, such as the width of Type B vehicles, which is usually 2.8m, and vehicle spacing S, the distance between the centers of the two bogies, which affects the curve passing performance. The benchmark value mapping is based on the "Metro Design Code" and "Metro Clearance Standard". The corresponding relationship between area type and benchmark limit value is established: the effective platform range is W / 2 + safety clearance, the effective platform corridor range is W / 2 + equipment installation space, and the effective platform outer wall (with pipelines) is W / 2 + pipeline layout margin.

[0079] S2.2: Obtain the parameters of the curve segment such as the curvature radius R, the length of the transition curve L, and the coordinates of the straight transition point (ZH) / transition circle point (HY) from the centerline of the line. According to Article E.0.5 of the "Metro Design Code" GB50157, the inner widening amount is E内 : The outer widening amount is E 外 : Where E is the curve widening, R is the radius of curvature, S is the vehicle spacing, l is the arc length from the calculation point to the start of the transition curve, and W is the vehicle width. The maximum of the inner and outer widenings is taken as the single-side widening of the curve. By interactively selecting the turnout center and the end points of the straight / lateral strands in CAD, the turnout type (such as No. 9 single turnout and No. 12 crossover) is obtained, as well as the frog number N, the turnout guide curve radius, and other parameters. According to Article 3.3.14 of the "Metro Gauge Standard" CJJ / T96, the single turnout is F = 150 + 50 (N - 7), which is applicable to turnouts with N ≥ 7. The crossover is F = 200 + 80 (N - 6). Where F is the turnout area widening, and N is the frog number. For areas with both curves and turns (such as turns within a curve), compare E and F and take the larger value as the dynamic widening D. a =max(E,F), straight line segments or non-branching areas only require the baseline value, and the dynamic widening amount D = D0 (no widening required).

[0080] S2.3: Process the straight segments, curved segments, and turnout areas in each area separately: for straight segments, the total limit value dynamic widening amount D = D0 (no widening required); for curved segments / turnout areas, the total limit value D = D0 + D a , where D is the building limit value, D0 is the building limit widening reference value, and D a The amount of widening of the building limit.

[0081] In a preferred embodiment of the present invention, the above step S3 may include:

[0082] S3.1: Based on the total building clearance, select multiple projection points on the line centerline. The projection points include the starting point, end point, and midpoint of the platform edge at the preset intervals.

[0083] S3.2: Bidirectionally offset each projection point in the direction perpendicular to the line centerline. The offset amount is the total building limit value of the corresponding area to obtain the inner and outer building limit range line control points;

[0084] S3.3: Connect the control points according to the area type. Within the valid platform range, directly connect the control points of the starting point and the end point to form a straight line segment building limit range line. Within the valid platform corridor range and side wall range, connect the control points at preset intervals in sequence to form a continuous straight line segment.

[0085] S3.4: Based on the obtained continuous straight line segments, automatically draw closed or continuous limit range lines using CAD drawing tools and mark the limit value parameters.

[0086] In an embodiment of the present invention, the projection points of the line centerline are accurately selected based on the total building limit value and control points are generated by bidirectional offset, so that differentiated and accurate drawing of building limit range lines in different areas is achieved. The effective platform range directly connects the start and end control points to form a straight line segment, ensuring the simplicity and compliance with regulations of the core boarding and alighting area. The effective platform corridor and side wall range connects the control points at preset intervals to generate continuous straight line segments, accurately covering the gradual widening requirements of complex areas. With the help of CAD drawing tools, closed or continuous limit range lines are automatically drawn and parameters are marked, avoiding errors caused by human measurement and connection in traditional manual drawing, improving the drawing efficiency and geometric accuracy of the limit range lines, and at the same time, through standardized control point connection rules, ensuring the uniformity of the limit drawings of each area and engineering traceability.

[0087] In an embodiment of the present invention, the specific steps include:

[0088] S3.1: Extract the coordinates of the starting point (PS1) and the ending point (PS2) of the platform edge from the line centerline as the core projection points. Set preset intervals according to design requirements (such as every 5m for straight segments and every 2m for curved segments). Evenly insert intermediate projection points on the line centerline. Automatically increase the spacing between projection points (such as every 1m) in curved segments and switch areas to ensure the accuracy of the limit line in geometrically complex areas. Mark special location points (such as switch cores and curve start and end points) as independent projection points.

[0089] S3.2: For each projection point, calculate the vertical direction vector through the tangent direction of the line centerline. The inner vertical vector is The outer vertical vector is Where A is the characteristic parameter of the transition curve, l is the arc length from the calculation point to the starting point of the transition curve, and each projection point is offset vertically inward and outward by the total building limit value of the corresponding area. The effective platform range offset is 2400 mm (assuming a Type B vehicle), and the curve section side wall offset is 2960 mm (baseline value + widening amount). Two sets of control points are generated: an inner control point set and an outer control point set.

[0090] S3.3: Directly connect the inner and outer control points of the starting point PS1 with the inner and outer control points of the end point PS2 to form four straight line segments: the inner limit line: PS1 inner → PS2 inner, the outer limit line: PS1 outer → PS2 outer. Connect the control points generated by each projection point in sequence at preset intervals to form a continuous broken line: the inner limit line: P1 inner → P2 inner → P3 inner → ..., the outer limit line: P1 outer → P2 outer → P3 outer → .... At the junction of different areas (such as the platform and the outer corridor), connect the control points with smooth transition curves to avoid sudden changes.

[0091] S3.4: Convert the control point coordinates into CAD commands (such as LINE and PLINE), draw closed polygons (such as platform areas) or continuous polylines (such as side wall limits), set the line type and color for different areas (such as solid red for platforms and dashed blue for side walls), mark key parameters on the limit lines, including the total limit value (such as 2960 mm), area type (such as valid platform), and special locations (such as curved segment R = 300 m), add engineering elements such as a drawing frame, scale, and north arrow, and generate a complete building limit drawing.

[0092] In a preferred embodiment of the present invention, the above step S4 may include:

[0093] S4.1: Connect the offset coordinates of the widening starting point and the half-widening point with a straight line to obtain the preliminary limit line;

[0094] S4.2: Based on the preliminary limit line, select multiple sampling points evenly along the line centerline from the widening start point to the half-widening point, and calculate the coordinates of each sampling point after the total construction limit value is offset perpendicular to the line centerline;

[0095] S4.3: Based on the offset coordinates of the sampling points, replace the preliminary limit line with a polyline consisting of multiple continuous line segments to correct the limit range deviation caused by the straight line connection;

[0096] S4.4: Based on the limit range deviation, by traversing each point on the line centerline, dynamically calculate and vertically offset to generate continuous limit range line control points, and automatically connect all control points using CAD drawing tools to form a smooth and closed limit range line.

[0097] In an embodiment of the present invention, a hierarchical processing strategy of preliminary straight line fitting, precise correction of sampling points, and dynamic generation of continuous limit lines is adopted for the complex linear features of the area from the widening starting point to the semi-widening point of the curve segment. This effectively solves the limit deviation problem of the traditional straight line approximation method in the curvature change area. The preliminary limit line is quickly generated to avoid the inefficiency of modeling from scratch, captures the actual widening amount at different positions of the curve segment, corrects the problem of the inner limit being too large or the outer limit being too small caused by the straight line connection, optimizes the straight line segment into a continuous broken line by encrypting the control points, makes the limit line more consistent with the geometric characteristics of the curve, and controls the error within the allowable range of the project. The automatic generation of limit lines in the entire range is realized, ensuring the seamless connection between the curve segment and the straight line segment and the switch area, forming a closed and smooth limit range, significantly improving the drawing accuracy and efficiency of complex linear areas, and providing a reliable digital design guarantee for the safety of the civil structure and vehicle operation of the subway station.

[0098] In an embodiment of the present invention, the specific steps include:

[0099] S4.1: Generate preliminary limit lines to determine the starting point of widening at key locations, the starting point of the line centerline from the straight segment into the transition curve segment, the position where the curve widening amount is 0, the half-widening point, and the position where the widening amount in the transition curve segment reaches 50% of the full widening amount. Where A is the characteristic parameter of the transition curve, l is the arc length from the calculation point to the starting point of the transition curve, and the total construction limit value D is offset in both directions perpendicular to the line centerline to obtain the coordinates after the inner / outer offset. The inner and outer offset points are connected respectively to form two straight line segments as the preliminary limit lines.

[0100] S4.2: The sampling interval is the line centerline from the widening start point to the semi-widening point. The interval length is the arc length between the two points. Set the preset sampling interval (such as 1m or 0.5m) according to the engineering accuracy requirements. Insert N sampling points in the interval. The straight line segment adopts the normal direction and the curved segment adopts the radial direction.

[0101] The total building limit value D is offset in the inner and outer directions respectively to obtain the inner offset point P′ 外 and the outer offset point P′ 内 , where A is the characteristic parameter of the transition curve, l is the arc length from the calculation point to the starting point of the transition curve, and D is the building limit value.

[0102] S4.3: Replace the inner and outer preliminary straight line segments with polylines. The inner polyline: Connect A 内 →P 1内 →P 2内 →…→B 内 , outer polyline: connect A in sequence 外 →P 1外 →P 2外 →…→B 外 In the transition curve segment, the curvature radius gradually decreases, and the straight line connection will cause the inner limit to be too large (straight line extrapolation) or the outer limit to be too small (straight line indentation). By encrypting the sampling points, the polyline can segmentally fit the curve widening trend. For example, near the half-widening point, it accurately reflects the gradual process of widening from 0 to 50%, avoiding the sudden change error of the straight line segment.

[0103] S4.4: Starting from the widening starting point, traverse all points along the centerline of the line (including straight segments, transition curve segments, and circular curve segments). For each point, extract the geometric parameters of the point (curvature radius R, tangent direction, and line type). Calculate the vertical direction vector using the above formula. Generate the coordinates of the control points after inner and outer offsets according to the total building limit value D. Automatically increase the density of sampling points in areas with drastic curvature changes (such as the midpoint of the transition curve) to ensure a smooth transition of the limit line. Closed area processing: For closed areas such as valid platforms, form a closed loop by connecting the first and last control points (for example, if the inner / outer control points of the start and end points coincide or are closed). CAD automated drawing imports all control point coordinates into the CAD drawing tool. Use the polyline (PLINE) or spline (SPLINE) function to connect: Maintain straight line connections to ensure simplicity. Use polyline fitting or spline interpolation to form a smooth limit range line. Mark the widening amount, total limit value D, and area type on the limit line.

[0104] In a preferred embodiment of the present invention, the above step S5 may include:

[0105] S5.1: Based on the vehicle model parameters and turnout type of the current line, call the associated widening reference value and turnout area limit rules stored in the pre-stored database;

[0106] S5.2: Based on the associated widening reference value and the turnout area boundary rules, interactively select the turnout center, the front end point of the straight strand, and the end point of the side strand through the CAD interface to determine the geometric direction and layout relationship of the turnout;

[0107] S5.3: Calculate the total construction clearance value of the turnout area based on the widening reference value, turnout parameters, and vehicle dynamic envelope;

[0108] S5.4: The total construction limit value of the turnout area is passed through the turnout straight and side strands. With the vertical line centerline as the reference, the control points of the inner and outer construction limit range lines of the turnout area are generated according to the total construction limit value offset. The control points are automatically connected by CAD tools to form a closed limit range line.

[0109] In an embodiment of the present invention, based on the database association between vehicle type parameters and turnout types, rapid calling of widening reference values ​​and limit rules is achieved, avoiding the tediousness and errors of manual search and calculation, and improving the standardization of turnout area limit design. With the help of the CAD interface, key position points of the turnout are interactively selected to accurately capture the geometric direction and layout relationship of the turnout, solving the problem of inaccurate layout parameter extraction in traditional empirical design. The total construction limit value is dynamically calculated based on the widening reference value, turnout parameters and vehicle dynamic envelope to ensure a safe match between the limit range and actual operating conditions, avoiding the limitations of fixed template design. Control points are generated by vertical offset and automatically connected to form a closed limit range line, realizing automatic and high-precision drawing of complex line types in the turnout area, greatly shortening the design cycle, and at the same time, the parameter linkage mechanism is used to improve the engineering adaptability of different turnout types and vehicle type combinations, providing a reliable digital solution for the civil structure design and vehicle operation safety of the turnout area, and effectively solving the problems of low efficiency, insufficient accuracy and poor parameter adaptability in traditional methods.

[0110] In an embodiment of the present invention, the specific steps include:

[0111] S5.1: Stores basic data for different vehicle types (e.g., Type A, Type B, and linear electric locomotives), including vehicle width W, vehicle spacing S, maximum axle weight, etc.; stores categorized turnout parameters, such as single turnouts (No. 9, No. 12), crossing crossovers, and symmetrical turnouts, including geometric parameters such as frog number N, guide curve radius, and turnout length; associates vehicle type with turnout type; presets corresponding widening reference values ​​(e.g., reference limits for effective platforms, outer corridors, and side walls) and limit rules (e.g., the calculation method for turnout area widening in the "Metro Limit Standard"); obtains the vehicle type (e.g., Type B) and turnout type (e.g., No. 9 single turnout) of the current line from the design document; and queries the database for matching widening reference values ​​and limit rules.

[0112] S5.2: As the geometric center and positioning reference of the turnout, the coordinates are obtained. It is located in the extension direction of the straight strand of the turnout and is used to determine the direction of the straight strand. It is located at the end of the side strand of the turnout and is used to determine the bifurcation direction of the side strand. The tangent direction of the straight strand is determined by the coordinate difference between the turnout center and the front end point P1 of the straight strand. The bifurcation angle of the side strand is determined by the coordinate difference between the turnout center and the end point P2 of the side strand. It is retrieved from the database according to the turnout type.

[0113] S5.3: Based on the area type (effective platform, outer corridor, side wall) and vehicle type, obtain the widening reference value from the database, and calculate the turnout widening amount Δ based on the turnout type and switch number. For example, for a single turnout (N=9), Δ=150+50(9-7)=250mm, and for a crossing turnout (N=12), Δ=200+80(12-6)=250mm. Combined with the vehicle dynamic envelope (taking into account the lateral vibration and deviation when the vehicle passes through the turnout), the calculated widening amount is corrected with a safety margin. The total limit value of each area in the turnout area is equal to the widening reference value plus the turnout widening amount.

[0114] S5.4: Starting from the turnout center, extract centerline segments along the straight strand and side strand respectively, with the length covering the entire turnout length. For the key position points on the centerline of the straight strand and side strand (turnout center O, front end of the straight strand P1, end point of the side strand P2, midpoint M of the guide curve, etc.), offset the total limit value D in both directions perpendicular to the centerline. The inner offset (pointing to the inner side of the line centerline) generates the inner control point Pinner, and the outer offset (away from the outer side of the line centerline) generates the outer control point Pouter. Connect the inner / outer control points of the straight strand to form the straight segment limit line. Fit a curve according to the guide curve radius in the guide curve segment, connect the inner / outer control points of the side strand to form the smooth curve segment limit line. At the front and end of the turnout, connect the inner and outer control points of the straight strand and side strand with straight lines to form a closed polygonal limit range. Automatically connect all control points using the polyline (PLINE) and arc (ARC) functions of the CAD tool.

[0115] In a preferred embodiment of the present invention, the above step S6 may include:

[0116] S6.1: Integrate the coordinates of the control points of the limit lines of each area, verify the closure, continuity and compliance with engineering specifications, and obtain the integrated results;

[0117] S6.2: Based on the integrated result, call a drawing command through the API interface of the CAD software to automatically convert the control point coordinates into a closed or continuous limit range line entity;

[0118] S6.3: Through the limit range line entity, different layers are assigned according to the area type, and the corresponding limit value, widening parameter and area identification are automatically marked;

[0119] S6.4: Obtain the final building clearance range drawing file based on the marked corresponding limit values, widening parameters, and area identification, associate it with the design parameter database, and store it in an editable CAD format file.

[0120] In an embodiment of the present invention, integrated verification ensures the geometric integrity (closure / continuity) and regulatory compliance of the limit lines of each area, avoids the risk of boundary dislocation or overlimit caused by manual integration, and improves design reliability. API interface calls directly convert control point coordinates into CAD entities, eliminating errors and inefficiencies in manual drawing, and improving the efficiency of drawing complex line types. Layer allocation and automatic annotation significantly improve the readability and review efficiency of drawings through hierarchical management of area types and parameter visualization, reducing human annotation errors. Parameter association and format storage realize two-way linkage between design data and drawings, support subsequent design iterations and collaborative work, and storage in standard CAD format ensures compatibility and editability. In summary, this step builds an efficient and accurate limit drawing delivery system through digital integration, automated drawing, intelligent annotation and parametric storage, solves the problems of insufficient accuracy, cumbersome processes and data fragmentation in traditional manual drawing, and provides standardized and intelligent technical support for the civil engineering design of subway stations.

[0121] In an embodiment of the present invention, the specific steps include:

[0122] S6.1: Sort the coordinates of the inner / outer limit line control points of each area, such as the valid platform, outer corridor, and side wall, in the order of line mileage to form a global control point list, ensuring that all control points are based on the same coordinate system. Automatically calibrate the coordinate deviations of different areas through the coordinate conversion interface. For closed areas (such as the valid platform range), verify whether the coordinates of the inner and outer control points of the starting and end points coincide (error ≤ 0.1mm) to avoid gaps or overlaps. For continuous non-closed areas (such as the side wall range), check whether the control points of adjacent segments are connected. (coordinate difference ≤ 0.5mm), traverse adjacent control points, observe the rate of change of the line segment slope, ensure there is no sudden change (such as the slope of the straight segment is consistent, and the curvature of the curved segment is continuous), and verify whether the total building limit value of each area meets the minimum safety distance requirements (such as the distance from the effective platform edge to the line centerline ≥ half the vehicle width + 1000mm) by comparing with the "Metro Design Code" GB50157, check whether the curve segment widening amount E and the switch area widening amount F are larger, and the curve platform widening amount ≤ 80mm (according to the "Metro Limit Standard" CJJ / T96).

[0123] S6.2: The CAD entity automatic drawing API interface is connected to the secondary development interface of the CAD software (such as AutoCAD), and a mapping relationship between the control point coordinates and the drawing instructions is established. For straight line areas (such as valid platforms), a LINE instruction is generated to connect the inner and outer control points of the starting and end points. The SPLINE or ARC instruction is used to fit a smooth curve according to the control point coordinates (such as inputting the ARC center, radius, and starting angle parameters). The CIRCLE instruction is called to draw an arc according to the guide curve radius and the branch center coordinates. For gradient areas with dense sampling points (such as from the half-widening point to the full-widening point), a PLINE instruction is generated to connect all the control points in sequence to form a continuous broken line. The entity attributes set the line type (such as solid line, dashed line) and line width (such as 0.3mm thick line for the valid platform limit and 0.2mm thin line for the side wall) to ensure compliance with the subway engineering drawing standards.

[0124] S6.3: Establish a standardized layer system and automatically assign the boundary entities of different areas to the corresponding layers through the API to ensure clear drawing hierarchy. Mark the total building limit value outside the limit range line with a font height of 3mm and a distance of 1mm from the line. Mark the widening amount in the curve section / turnout area and indicate the widening type (curve / turnout). Mark the area type at the starting point of each area, use a leader line to point to the corresponding limit line, and detect the marking position to avoid overlapping with the limit line or other elements.

[0125] S6.4: Assemble drawing elements such as drawing frames, scales, compasses, and legends. The drawing frame template complies with the "Urban Rail Transit Engineering Drawing Standard" CJJ / T285, ensuring that the limit lines are displayed in the center. Design instructions and signature columns are reserved in non-critical areas (such as blank spaces). Embed metadata in CAD drawings: Associate the design parameters (vehicle type, turnout type, curve radius, etc.) corresponding to the control point coordinates through extended attributes (XDATA). When the vehicle type parameters or curve radius in the design parameter database change, the API automatically triggers the drawing update, recalculates and refreshes the limit lines, and stores them in standard CAD formats (such as DWG2018 version), which is compatible with mainstream design software. Attach lightweight files (such as DXF) for cross-platform sharing, and save the original project files at the same time.

[0126] like Figure 2 As shown, an embodiment of the present invention also provides a CAD-based device for drawing a building boundary range diagram of a subway station platform layer, comprising:

[0127] An acquisition module is configured to obtain a line centerline entity object at the platform level of a subway station, and divide the building clearance area into an effective platform range, an effective platform corridor range, and a side wall range based on the line centerline; obtain a building clearance reference value for each area based on preset vehicle type parameters and area type, and obtain a dynamic widening value by combining the larger value of the curve widening value and the turnout widening value, where the total building clearance value is the sum of the reference value and the dynamic widening value;

[0128] The generation module is used to obtain the straight segment construction clearance range line by offsetting the coordinates of the projection points in the direction perpendicular to the line centerline based on the total construction clearance value; based on the straight segment construction clearance range line, the offset coordinates of the widening starting point and the semi-widening point are connected with a straight line to generate a preliminary clearance line, and multiple sampling points are evenly selected along the line centerline. The coordinates of each point after vertical offset are calculated, and a polyline is generated to correct the straight line deviation. The points on the line centerline are traversed to obtain a continuous clearance range line based on the vertical offset; based on the continuous clearance range line, the widening reference value of the vehicle type parameters and turnout combination in the pre-stored database is called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand, and the end point of the side strand to automatically obtain the construction clearance range line of the turnout area;

[0129] The processing module is used to automatically draw the calculation results into a building limit range diagram through a CAD interface based on the straight segment building limit range line, the continuous limit range line and the switch area building limit range line.

[0130] An embodiment of the present invention further provides a computing device comprising: a processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the device described above is executed. All implementations in the above device embodiments are applicable to this embodiment and can achieve the same technical effects.

[0131] The embodiment of the present invention further provides a computer-readable storage medium storing instructions, which, when executed on a computer, causes the computer to execute the apparatus described above. All implementations in the above apparatus embodiments are applicable to this embodiment and can achieve the same technical effects.

[0132] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A CAD-based method for drawing a building boundary range diagram of a subway station platform layer is characterized in that: The method comprises: S1: Obtain the line centerline entity object of the subway station platform layer, and divide the building limit area into the effective platform range, the effective platform corridor range and the side wall range based on the line centerline; S2: Based on the preset vehicle model parameters and area type, a building clearance reference value is obtained for each area, and the larger value of the curve widening amount and the turnout widening amount is combined to obtain a dynamic widening amount, wherein the total building clearance value is the sum of the reference value and the dynamic widening amount; S3: Based on the total building limit value, the coordinates of the projection point are offset in the direction perpendicular to the line centerline to obtain the straight segment building limit range line; S4: Based on the straight segment construction clearance line, connect the offset coordinates of the widening start point and the half-widening point with a straight line to obtain a preliminary clearance line. Select multiple sampling points evenly along the line centerline, calculate the coordinates of each point after vertical offset, and obtain a polyline to correct the straight line deviation. Traverse each point on the line centerline and obtain a continuous clearance line based on the vertical offset. S5: Based on the continuous clearance range line, the vehicle type parameters and the widening reference value of the turnout combination in the pre-stored database are called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand, and the construction clearance range line of the turnout area is automatically obtained; S6: Based on the straight segment building limit range line, continuous limit range line and switch area building limit range line, the calculation results are automatically drawn as a building limit range diagram through the CAD interface.

2. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 1 is characterized in that: Obtain the line centerline entity object of the subway station platform layer, and divide the building limit area into the effective platform range, the effective platform corridor range, and the side wall range based on the line centerline, including: S1.1: Use CAD software to extract the line centerline entity objects in the subway station platform design drawing; S1.2: Based on the centerline entity object, the geometric characteristics of the line centerline and the preset area division rules, the building limit area is divided into the effective platform range, the effective platform corridor range, the effective platform outer wall range and the station outer wall range.

3. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 2, characterized in that: Based on the preset vehicle model parameters and area type, the building clearance baseline value of each area is obtained, and the larger value of the curve widening amount and the turnout widening amount is combined to obtain the dynamic widening amount, where the total building clearance value is the sum of the baseline value and the dynamic widening amount, including: S2.1: Based on the division results of the effective platform range, effective platform corridor range, effective platform outer wall range, and station outer wall range, the corresponding building clearance reference values ​​are matched according to the preset vehicle model parameters and area type; S2.2: Based on the building clearance reference value, calculate the curve widening amount and turnout widening amount for the curve section and turnout area respectively, and take the larger value of the two as the dynamic widening amount; S2.3: Add the dynamic widening amount to the building clearance reference value to obtain the total building clearance value for each area.

4. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 3 is characterized in that: Based on the total building limit value, the coordinates of the projection point are offset in the direction perpendicular to the line centerline to obtain the straight segment building limit range line, including: S3.1: Based on the total building clearance, select multiple projection points on the line centerline. The projection points include the starting point, end point, and midpoint of the platform edge at the preset intervals. S3.2: Bidirectionally offset each projection point in the direction perpendicular to the line centerline. The offset amount is the total building limit value of the corresponding area to obtain the inner and outer building limit range line control points; S3.3: Connect the control points according to the area type. Within the valid platform range, directly connect the control points of the starting point and the end point to form a straight line segment building limit range line. Within the valid platform corridor range and side wall range, connect the control points at preset intervals in sequence to form a continuous straight line segment. S3.4: Based on the obtained continuous straight line segments, automatically draw closed or continuous limit range lines using CAD drawing tools and mark the limit value parameters.

5. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 4 is characterized in that: Based on the straight segment construction limit line, the offset coordinates of the widening start point and the half-widening point are connected with a straight line to obtain the preliminary limit line. Multiple sampling points are evenly selected along the line centerline, and the coordinates of each point after vertical offset are calculated to obtain a polyline to correct the straight line deviation. The continuous limit line is obtained based on the vertical offset by traversing each point on the line centerline, including: S4.1: Connect the offset coordinates of the widening starting point and the half-widening point with a straight line to obtain the preliminary limit line; S4.2: Based on the preliminary limit line, select multiple sampling points evenly along the line centerline from the widening start point to the half-widening point, and calculate the coordinates of each sampling point after the total construction limit value is offset perpendicular to the line centerline; S4.3: Based on the offset coordinates of the sampling points, replace the preliminary limit line with a polyline consisting of multiple continuous line segments to correct the limit range deviation caused by the straight line connection; S4.4: Based on the limit range deviation, by traversing each point on the line centerline, dynamically calculate and vertically offset to generate continuous limit range line control points, and automatically connect all control points using CAD drawing tools to form a smooth and closed limit range line.

6. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 5, characterized in that: Based on the continuous clearance range line, the vehicle type parameters and the widening reference value of the turnout combination in the pre-stored database are called. By interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand to determine the direction, the construction clearance range line of the turnout area is automatically obtained, including: S5.1: Based on the vehicle model parameters and turnout type of the current line, call the associated widening reference value and turnout area limit rules stored in the pre-stored database; S5.2: Based on the associated widening reference value and the turnout area boundary rules, interactively select the turnout center, the front end point of the straight strand, and the end point of the side strand through the CAD interface to determine the geometric direction and layout relationship of the turnout; S5.3: Calculate the total construction clearance value of the turnout area based on the widening reference value, turnout parameters, and vehicle dynamic envelope; S5.4: The total construction limit value of the turnout area is passed through the turnout straight and side strands. With the vertical line centerline as the reference, the control points of the inner and outer construction limit range lines of the turnout area are generated according to the total construction limit value offset. The control points are automatically connected by CAD tools to form a closed limit range line.

7. The method for drawing a subway station platform building boundary range diagram based on CAD according to claim 6, characterized in that: Based on the straight segment building clearance line, continuous clearance line and switch area building clearance line, the calculation results are automatically drawn into a building clearance diagram through the CAD interface, including: S6.1: Integrate the coordinates of the control points of the limit lines of each area, verify the closure, continuity and compliance with engineering specifications, and obtain the integrated results; S6.2: Based on the integrated result, call a drawing command through the API interface of the CAD software to automatically convert the control point coordinates into a closed or continuous limit range line entity; S6.3: Through the limit range line entity, different layers are assigned according to the area type, and the corresponding limit value, widening parameter and area identification are automatically marked; S6.4: Obtain the final building clearance range drawing file based on the marked corresponding limit values, widening parameters, and area identification, associate it with the design parameter database, and store it in an editable CAD format file.

8. A CAD-based device for drawing a building boundary map of a subway station platform, the system implementing the method according to any one of claims 1 to 7, characterized in that: include: An acquisition module is configured to obtain a line centerline entity object at the platform level of a subway station, and divide the building clearance area into an effective platform range, an effective platform corridor range, and a side wall range based on the line centerline; obtain a building clearance reference value for each area based on preset vehicle type parameters and area type, and obtain a dynamic widening value by combining the larger value of the curve widening value and the turnout widening value, where the total building clearance value is the sum of the reference value and the dynamic widening value; A generation module is used to obtain the straight segment building limit range line by offsetting the coordinates of the projection point in the direction perpendicular to the line center line based on the total building limit value; Based on the straight segment construction limit line, the offset coordinates of the widening starting point and the half-widening point are connected with a straight line to generate a preliminary limit line. Multiple sampling points are evenly selected along the line centerline, and the coordinates of each point after vertical offset are calculated. A polyline is generated to correct the straight line deviation. Each point on the line centerline is traversed to obtain a continuous limit line based on the vertical offset. Based on the continuous clearance range line, the widening reference value of the vehicle type parameters and turnout combination stored in the database is called, and the direction is determined by interactively selecting the turnout core, the front end point of the straight strand and the end point of the side strand to automatically obtain the construction clearance range line of the turnout area; The processing module is used to automatically draw the calculation results into a building limit range diagram through a CAD interface based on the straight segment building limit range line, the continuous limit range line and the switch area building limit range line.

9. A computing device, characterized in that include: one or more processors; A storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program, which, when executed by a processor, implements the method according to any one of claims 1 to 7.

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