CN114861287B - BIM-based tunnel structure open cut section parametric design method - Google Patents
BIM-based tunnel structure open cut section parametric design method Download PDFInfo
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Abstract
The invention relates to a BIM-based tunnel structure open cut section parameterization design method, which relates to the technical field of BIM in engineering design industry, and comprises the following steps: the method has the advantages that parameterized design of the open excavation section of the tunnel is realized through parameterized deconstruction of different data, so that intermediate links do not need to be considered in the design process, the finally output drawing and engineering quantity come from the input of the model and original driving parameters, design optimization and change are faced, the design efficiency is ensured, and meanwhile, the accuracy and consistency of design results are ensured.
Description
Technical Field
The invention relates to the technical field of BIM in engineering design industry, in particular to a BIM-based parametric design method for an open cut section of a tunnel structure.
Background
BIM is an abbreviation of building information model, and is an engineering data model integrating various related information of construction projects on the basis of three-dimensional digital technology. The provided brand-new engineering design process concept parameterization change technology can help designers to effectively shorten the design time, improve the design quality and improve the response capability to clients and collaborators. The collaborative design greatly improves the mutual communication among design specialties, avoids the incompleteness and uncertainty of design data caused by physical transmission, improves the design quality and improves the design efficiency. BIM technology allows designers to make any desired modifications at any time, at any location, and the design and drawings will remain consistent, and complete throughout.
In more than ten years, the BIM technology is rapidly developed in China, particularly in the field of buildings, a plurality of mature application tools and systems are available on the market, and meanwhile, the BIM technology also has industrial standard policies, but the BIM technology is weak in application in tunnel engineering, no targeted technical tool can be used, and no good practical case can be referred to.
At present, engineering modeling of a closed frame structure of an open cut section of a tunnel in China is mostly manual modeling, variable cross section types cannot be faced, efficiency is low, the accuracy rate of manual modeling is low, and relevant patents about BIM design of open cut of the tunnel are disclosed through retrieval. For example, the application with the chinese patent application number of CN201810817826.5 discloses a method for designing a foundation pit excavation surface of an open excavation section of a tunnel based on BIM, which mainly solves the problem that the application of tunnel foundation pit excavation does not relate to a closed frame structure part of the open excavation section, so that a parameterization design method for the open excavation section of the tunnel structure based on BIM needs to be designed to solve the problems.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is directed to a BIM-based parametric design method for an open cut segment of a tunnel structure.
The technical scheme of the invention is as follows:
a BIM-based tunnel structure open cut section parameterization design method comprises the following steps:
s1, measuring data is obtained and used for obtaining the measuring data of the location of a project, corresponding equipment is prepared, and a terrain curved surface is formed in a triangular network mode;
s2, establishing a tunnel plane route, parameterizing the complete route, decomposing the route into fixed units according to a route rule, driving through parameters, and associating through data;
s3, establishing parametric analysis of the longitudinal section of the route, wherein the parametric analysis is used for carrying out unit analysis on the terminal surface line to obtain the parameters of the length, the radius, the pile number and the gradient of different types of sections of straight lines and curves, and the parametric analysis is completed through parametric driving;
s4, establishing a parameterized cross section of the tunnel closed frame structure, and analyzing the type of the standard cross section and extracting parameters of the cross section to adapt to different types of requirements;
s5, establishing a closed frame model of the open excavation section of the tunnel, carrying out sampling analysis on a plane route and a longitudinal section, and sequentially arranging cross sections of two adjacent sampling points to fuse to form a model;
and S6, outputting drawings and calculating the engineering quantity, integrating the tunnel open cut structure model and the terrain curved surface model, and obtaining the engineering quantity between pile numbers through the volume calculated by the three-dimensional model formed by fusing the two cross sections.
The technical effect of adopting the further scheme is as follows: according to the invention, a set of design method for tunnel open cut engineering is established through a parameterized model of the BIM technology, and a practical basis is provided for the deep development of the BIM technology in the tunnel engineering and the research and development of related tools.
As a preferred embodiment, the establishing a parameterized transverse plane of the tunnel closing frame structure in step S4 specifically includes the following steps:
s401, analyzing the type of the standard cross section, determining a central point of the cross section, wherein the central point is arranged at a route position and is used for obtaining a spatial position point of the cross section of each fixed pile number;
s402, extracting parameters of the cross section, and obtaining key control parameters of all components by finding the relation of other parts relative to the central point based on the central point;
s403, extracting parameters of the cross section for completing parameter control of the cross section;
and S404, according to the arrangement requirements of different sections of the tunnel open cut section, modifying cross section parameters to adapt to different types of requirements.
The technical effect of adopting the further scheme is as follows: the method realizes rapid parameterization design work by developing the existing two-dimensional and three-dimensional design platform, and solves the process from modeling to designing output quantity of a tunnel route, a longitudinal section and a cross section by combining two dimensions and three dimensions.
As a preferred embodiment, the building of the closed frame model of the open-cut tunnel segment in step S5 specifically includes the following steps:
s501, sampling and analyzing the plane route of the step S2 and the vertical section of the step S3 to obtain the spatial position of the required key point: the sampling points are generally sampled at fixed distances according to the types of routes and every 2 meters, or the sampling points are generally sampled according to key positions of a variable slope point, a straight line intersection point, a curve intersection point and a curve central point and are used for obtaining central point coordinates of all the sampling points in the required cross section spatial arrangement, and the central point coordinates consist of a position plane XY value and a corresponding longitudinal section Z value;
s502, arranging the cross sections of two adjacent sampling points in sequence according to the relationship among the plane route, the longitudinal section line and the cross section type of the method in the step S401, and fusing to form a model.
The technical effect of adopting the further scheme is as follows: the project is actually checked in real time in the design process, meanwhile, the final model data comes from the original design parameters, if the measured data is updated, the terrain model is automatically updated, the plane route or the longitudinal section is updated, the corresponding spatial sampling position is updated, meanwhile, the cross section spatial position arranged at the position is updated, and the model is updated accordingly.
As a preferred embodiment, the outputting of the drawing and the calculating of the engineering quantity in step S6 specifically include the following steps:
s601, integrating a tunnel open cut structure model and a terrain curved surface model, and transversely sectioning at any pile number position of a plane route to obtain a cross section diagram with accurate position and obtain the relation between a tunnel and the ground;
s602, when the spatial position is sampled by adopting the S501 method in the step S5, the plane pile number of each sampling point is simultaneously contained in each sampling point, the pile number is simultaneously recorded in the arranged cross section, the volume is calculated through a three-dimensional model formed by fusing the two cross sections, the engineering quantity between the two pile numbers is obtained, and the engineering quantity between any two pile numbers can be obtained by accumulating.
The technical effect of adopting the further scheme is as follows: any design change can be directly acted on the final model, and the engineering quantity calculated by the drawing generated by model sectioning and the model volume is directly influenced by the model, so that the output design result is synchronous with the input design change in real time, and the requirements during use are met.
As a preferred embodiment, the measurement data in step S1 is provided by a measurement unit, the data types in step S1 are point coordinates and point elevation data, and the triangulation method in step S1 is used by forming a plane with 3 similar points.
The technical effect of adopting the further scheme is as follows: and the spatial position points of the cross section of each fixed pile number are obtained.
In a preferred embodiment, the unit in step S2 includes a straight line segment, a curved line segment, and a moderate curved line segment, and is configured to perform parameterization on the stake number, the start point and end point data, and the type data of each route segment. The technical effect of adopting the further scheme is as follows: for obtaining key control parameters for all components.
As a preferred embodiment, the calculation method of the plane stake number is as follows: and calculating the corresponding stake number according to the distance between the sampling point and the starting point of the route.
The technical effect of adopting the further scheme is as follows: for facilitating the calculation.
As a preferred embodiment, the relationship between the other parts in step S402 and the central point includes the thickness of the road surface formed by the distance between the road surface and the central point, the position of the side wall determined by the distance between the side wall and the central point, and the position of the top plate determined by the distance between the top plate and the central point.
The technical effect of adopting the further scheme is as follows: for guaranteeing the accuracy of the final data.
As a preferred embodiment, the corresponding devices in step S1 include a control terminal, a display screen, a monitoring camera, a switch, and a measuring device.
The technical effect of adopting the further scheme is as follows: and carrying out overall power control when the whole equipment is in normal operation.
The invention has the following advantages and beneficial effects:
1. according to the invention, a set of design method for the tunnel open cut engineering is established through a parameterized model of a BIM technology, a practical basis is provided for the deepening of the BIM technology in the tunnel engineering and the research and development of related tools, the rapid parameterized design work is realized through the parameterized method and the development of the existing two-dimensional and three-dimensional design platform, the process from modeling to drawing quantity of a design drawing of a tunnel route, a longitudinal section and a cross section is solved through the combination of two dimensions and three dimensions, and the parameterized design of the tunnel open cut section is realized.
2. In the invention, the parameterization of different data is deconstructed, and the parameterization driving relation is established, so that an intermediate link is not needed to be considered in the design process, and a designer can obtain accurate model drawings and engineering quantities by inputting required design change conditions in parameters, thereby simplifying the design process.
3. In the invention, all three-dimensional models are manufactured according to actual engineering positions and parameters, including the ground, tunnels and the like, so that the actual verification is carried out on projects in real time in the design process, meanwhile, the final model data comes from the original design parameters, if the measurement data is updated, the terrain model is automatically updated, the plane route or the longitudinal section is updated, the corresponding spatial sampling position is updated, meanwhile, the spatial position of the cross section arranged at the position is updated, the model is updated therewith, and the drawing generated by cutting the model and the engineering quantity calculated by the volume of the model are directly influenced by the model, therefore, the output design result is synchronous with the input design change in real time, and the requirements during use are met.
Drawings
Fig. 1 is a flowchart of a parameterized drive whole process design of a BIM-based tunnel structure open cut segment parameterized design method according to an embodiment of the present invention;
fig. 2 is a basic flowchart of a parameterization technology of a parameterization design method for an open cut section of a tunnel structure based on BIM according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a relationship among a plane route, a longitudinal section line and a cross section type of a BIM-based tunnel structure open cut segment parameterization design method according to an embodiment of the present invention;
fig. 4 is a parameterized data diagram of a vertical section of a route of a parameterized design method for an open cut segment of a tunnel structure based on BIM according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional parametric relationship diagram of a BIM-based tunnel structure open-cut segment parametric design method provided in an embodiment of the present invention;
fig. 6 is a schematic diagram of refined parameter control points of a BIM-based tunnel structure open-cut segment parametric design method provided in an embodiment of the present invention;
fig. 7 is a schematic diagram of a parameterized cross section of a BIM-based tunnel structure open-cut segment parameterized design method according to an embodiment of the present invention;
fig. 8 is a schematic diagram of sampling space points of a tunnel model established by the BIM-based tunnel structure open-cut segment parameterization design method according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention will be further described with reference to the drawings and specific examples.
Example 1
As shown in fig. 1 to 8, the present invention provides a technical solution: a BIM-based tunnel structure open cut section parameterization design method comprises the following steps:
s1, measuring data;
s2, establishing a tunnel plane route;
s3, establishing a longitudinal section parametric analysis of the route;
s4, establishing a parameterized cross section of the closed frame structure of the tunnel; s5, establishing a closed frame model of the open excavation section of the tunnel;
s6, outputting a drawing and calculating the engineering quantity;
the step S1 is to measure data, to obtain the measured data of the location of the project, to prepare corresponding equipment, and to form a terrain curved surface by means of a triangulation network;
the tunnel plane route is established in the step S2 and used for parameterizing the complete route, decomposing the route into fixed units according to the route rule, driving through the parameters and associating through data;
the step S3 is used for establishing parametric analysis of the longitudinal section of the route, and obtaining the parameters of the length, the radius, the pile number and the gradient of different types of sections of straight lines and curves through unit analysis of the terminal surface line, and completing the parametric driving;
in the step S4, a parameterized cross section of the tunnel closed frame structure is established and is used for analyzing the type of the standard cross section and extracting parameters of the cross section to adapt to different types of requirements;
in the step S5, a closed frame model of the open excavation section of the tunnel is established and is used for carrying out sampling analysis on a plane route and a longitudinal section, and the cross sections of two adjacent sampling points are sequentially arranged to be fused to form a model;
and in the step S6, outputting a drawing and calculating the engineering quantity, integrating the tunnel open cut structure model and the terrain curved surface model, and obtaining the engineering quantity between pile numbers through the volume calculated by the three-dimensional model formed by fusing the two cross sections.
In this embodiment, the measurement data in step S1 is provided by a measurement unit, the data types in step S1 are point coordinates and point elevation data, and the triangulation method in step S1 is used by forming a plane by using 3 similar points.
Example 2
As shown in fig. 1 to 8, the establishing of the parameterized cross section of the tunnel closed frame structure in step S4 specifically includes the following steps:
s401, analyzing the type of the standard cross section, and determining a central point of the cross section, wherein the central point is arranged at a route position and is used for obtaining a spatial position point of the cross section of each fixed pile number;
as can be seen from fig. 4: auxiliary comparison is carried out on the parameterized data graph of the route longitudinal section;
s402, extracting parameters of the cross section, and obtaining key control parameters of all components by finding the relation of other parts relative to the central point based on the central point;
as can be seen from fig. 3: the relationship among the plane route, the longitudinal section line and the cross section type is shown in the figure;
as can be seen from fig. 5:
point P1 is relative to the center point position (horizontal X axis position = -left side wall distance-side wall thickness; vertical Y axis position = top plate distance + top plate thickness)
Point P2 is relative to the center point position (horizontal X-axis position = right side wall distance + side wall thickness; vertical Y-axis position = top plate distance + top plate thickness)
Point P3 is located relative to the center point (horizontal X-axis position = -left side wall distance-side wall thickness; vertical Y-axis position = -road surface thickness-top plate thickness)
Point P4 is relative to the center point position (horizontal X axis position = right side wall distance + side wall thickness; vertical Y axis position = -road surface thickness-top plate thickness)
Establishing control parameters of control points of all parts of the complete cross section relative to a central point through the corresponding relation;
as can be seen from fig. 6:
through the logical relationship, the parameter control points are further refined:
as can be seen from fig. 7:
according to the relation, the position logic relation of all control points of the cross section structure can be found in sequence, finally, a parameterized graph of the cross section is formed, all points are connected into a line according to the relation of the cross section graph to form a closed area, and then corresponding closed surfaces of all parts can be formed;
s403, extracting parameters of the cross section for completing parameter control of the cross section;
and S404, according to the arrangement requirements of different sections of the tunnel open cut section, modifying cross section parameters to adapt to different types of requirements.
The method for establishing the closed frame model of the tunnel open cut section in the step S5 specifically comprises the following steps:
s501, sampling and analyzing the plane route in the step S2 and the vertical section in the step S3 to obtain the spatial position of the required key point: the sampling points are generally sampled at fixed distances according to the types of routes and every 2 meters, or the sampling points are generally sampled according to key positions of a variable slope point, a straight line intersection point, a curve intersection point and a curve central point and are used for obtaining central point coordinates of all the sampling points in the required cross section spatial arrangement, and the central point coordinates consist of a position plane XY value and a corresponding longitudinal section Z value;
s502, arranging the cross sections of two adjacent sampling points in sequence according to the relationship among the plane route, the longitudinal section line and the cross section type of the method in the S401 in the step S4 to form a model through fusion.
The step S6 of outputting the drawing and calculating the engineering quantity specifically comprises the following steps:
s601, integrating a tunnel open cut structure model and a terrain curved surface model, and transversely sectioning at any pile number position of a plane route to obtain a cross section diagram with accurate position and obtain the relation between a tunnel and the ground;
s602, in the step S5, while the method in the step S501 is adopted to carry out spatial position sampling, the plane pile number used for each sampling point simultaneously comprises the point, the pile number is simultaneously recorded in the arranged cross section, the volume is calculated through a three-dimensional model formed by fusing the two cross sections, the engineering quantity between the two pile numbers is obtained, and the engineering quantity between any two pile numbers can be obtained by accumulating.
In this embodiment, in step S2, the unit includes a straight line segment, a curve segment, and a transition curve segment, and is configured to perform parameterization processing on a post number, start point and end point data, and type data of each route segment, where the plane post number is calculated in a manner that: corresponding pile numbers can be calculated according to the distance between the sampling points and the starting points of the route, the relation between other parts in the step S402 and the central point comprises the thickness of the road surface formed by the distance between the road surface and the central point, the distance between the side wall and the central point can determine the position of the side wall, and the distance between the top plate and the central point can determine the position of the top plate, and corresponding equipment in the step S1 comprises a control terminal, a display screen, a monitoring camera, an exchanger and measuring equipment.
The working principle is as follows:
as shown in figures 1-8, the invention establishes a set of design method aiming at the open cut engineering of the tunnel through the parameterized model of the BIM technology, provides a practical basis for the deepening of the BIM technology in the tunnel engineering and the research and development of related tools, realizes the rapid parameterized design work through the parameterized method and the development of the existing two-dimensional and three-dimensional design platform, solves the process from modeling to designing drawing quantity of the tunnel route, the longitudinal section and the cross section through the combination of two-dimensional and three-dimensional, realizes the parameterized design of the open cut section of the tunnel, establishes the parameterized driving relationship through the parameterized deconstruction of different data, ensures the accuracy and consistency of the design results without considering intermediate links in the design process by inputting the required design change conditions in the parameters by designers, simplifies the design process, ensures the accuracy and consistency of the design results while ensuring the design efficiency, all three-dimensional models are manufactured according to the actual engineering position and parameters, including the input of ground, the original driving parameters, the design optimization and the change of the design parameters are realized by the real-time updating of the actual design data of the design model and the real-time updating of the design data of the design model, thereby ensuring the update of the real-time updating of the design data of the design model and the real-time updating of the corresponding design data of the design model, and the real-time updating of the corresponding design results of the design model, and the update of the real-time updating of the design results of the real-time updating of the design data of the design model, meets the requirements in use.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A BIM-based tunnel structure open cut section parameterization design method is characterized by comprising the following steps:
s1, measuring data;
s2, establishing a tunnel plane route;
s3, establishing a longitudinal section parametric analysis of the route;
s4, establishing a parameterized cross section of the closed frame structure of the tunnel;
s5, establishing a closed frame model of the open excavation section of the tunnel;
s6, outputting a drawing and calculating the engineering quantity;
wherein, the first and the second end of the pipe are connected with each other,
the step S1 is used for acquiring measurement data of the location of the project, preparing corresponding equipment and forming a terrain curved surface model in a triangulation network mode;
the step S2 is used for parameterizing the complete route, decomposing the route into fixed units according to a route rule, driving through parameters and associating through data;
the step S3 is used for obtaining the length, radius, pile number and gradient parameters of different types of sections of straight lines and curves through unit analysis of the terminal surface lines and completing the operation through parametric driving;
the step S4 is used for analyzing the type of the standard cross section and extracting each parameter of the cross section to adapt to different types of requirements;
in the step S4, establishing a parameterized cross section of the closed frame structure of the tunnel specifically includes the following steps:
s401, analyzing the type of the standard cross section, determining a central point of the cross section, wherein the central point is arranged at a route position and is used for obtaining a spatial position point of the cross section of each fixed pile number;
s402, extracting parameters of the cross section, and obtaining key control parameters of all components by finding the relation of other parts relative to the central point based on the central point;
s403, extracting parameters of the cross section for completing parameter control of the cross section;
s404, according to the arrangement requirements of different sections of the tunnel open cut section, the method is used for modifying cross section parameters and adapting to different types of requirements;
the step S5 is used for sampling and analyzing the plane route and the longitudinal section, the cross sections are sequentially arranged on the basis of the relation among the plane route, the longitudinal section line and the cross section type, and the cross sections of two adjacent sampling points are fused to form a closed frame model of the open cut section of the tunnel; and S6, integrating the tunnel open cut section closed frame model and the terrain curved surface model, and obtaining the engineering quantity between pile numbers according to the volume calculated by the three-dimensional model formed by fusing the two cross sections.
2. The BIM-based tunnel structure open-cut section parametric design method according to claim 1, wherein the building of the closed frame model of the tunnel open-cut section in the step S5 specifically comprises the following steps:
s501, sampling and analyzing the plane route of the step S2 and the vertical section of the step S3 to obtain the spatial position of the required key point: sampling is generally carried out on the sampling points at fixed distances according to the types of routes, and one sampling point is made every 2 meters, or the sampling points are generally sampled according to key positions of a variable slope point, a straight line intersection point, a curve intersection point and a curve central point to obtain central point coordinates of all the sampling points in the required cross section spatial arrangement, wherein the central point coordinates consist of a position plane XY value and a corresponding longitudinal section Z value;
s502, arranging the cross-section members in sequence according to the relationship among the plane route, the longitudinal section line and the cross-section type of the method in the step S401, and fusing the cross sections of two adjacent sampling points to form a closed frame model of the open cut section of the tunnel.
3. The BIM-based tunnel structure open cut segment parameterization design method according to claim 2, wherein the step S6 of outputting drawings and calculating engineering quantities comprises the following steps:
s601, integrating a closed frame model and a terrain curved surface model of the open cut section of the tunnel, and transversely sectioning the open cut section of the tunnel at any pile number position of a plane route to obtain a cross sectional diagram with accurate position and obtain the relation between the tunnel and the ground;
s602, in the step S5, while the method in the step S501 is adopted to carry out spatial position sampling, each sampling point simultaneously comprises a plane pile number of the point, the pile numbers are simultaneously recorded in the arranged cross sections, the volume is calculated through a three-dimensional model formed by fusing the two cross sections, the engineering quantity between the two pile numbers is obtained, and the engineering quantity between any two pile numbers can be obtained by accumulating.
4. The BIM-based tunnel structure open cut segment parameterization design method according to claim 1, characterized in that: the measurement data in the step S1 are provided by a measurement unit, the data types in the step S1 are point coordinates and point elevation data, and the triangulation network in the step S1 is used by forming a plane by using 3 similar points.
5. The BIM-based tunnel structure open cut segment parametric design method according to claim 1, characterized in that: in the step S2, the unit includes a straight line segment, a curve segment, and a transition curve segment, and is used to perform parameterization processing on the pile number, the start point, the end point data, and the type data of each route segment.
6. The BIM-based tunnel structure open cut segment parametric design method according to claim 3, characterized in that: the calculation mode of the plane pile number is as follows: and calculating the corresponding pile number according to the distance between the sampling point and the starting point of the route.
7. The BIM-based tunnel structure open cut segment parameterization design method according to claim 1, characterized in that: in the step S402, the relationship between each of the other parts and the center point includes a thickness of a road surface formed by a distance between the road surface and the center point, a position of the side wall determined by the distance between the side wall and the center point, and a position of the top plate determined by the distance between the top plate and the center point.
8. The BIM-based tunnel structure open cut segment parametric design method according to claim 1, characterized in that: and the corresponding equipment in the step S1 comprises a control terminal, a display screen, a monitoring camera, a switch and measuring equipment.
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