CN108170988B - Three-step seven-step method for tunnel excavation based on BIM technology - Google Patents

Three-step seven-step method for tunnel excavation based on BIM technology Download PDF

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CN108170988B
CN108170988B CN201810062121.7A CN201810062121A CN108170988B CN 108170988 B CN108170988 B CN 108170988B CN 201810062121 A CN201810062121 A CN 201810062121A CN 108170988 B CN108170988 B CN 108170988B
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tunnel
subsection
splitting
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CN108170988A (en
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辜斌
赵立
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SIMUTECH Inc
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Abstract

The invention provides a three-step seven-step method for tunnel excavation based on a BIM technology, which comprises the following steps of: s1, forming basic data information of the design construction project according to construction requirements of the construction project, and configuring relevant parameters of the project body in sequence; s2, according to the characteristics of model subsection construction, establishing subsection constraint conditions of subsection direction, subsection path, length, deviation and rule, generating a subsection surface, and then carrying out subsection Boolean operation with an engineering design result model to obtain a series of subsection models; s3, according to the characteristics of tunnel excavation three-step seven-step method construction, setting the initial splitting direction, configuring parameters of each size in the splitting method and rule constraint conditions, generating splitting surfaces, and then segmenting the segmentation model along the selected central line to obtain a segmentation model. The precision and the accuracy of construction management of engineering projects are improved by the tunnel model dividing method of excavating three steps and seven steps, and the project execution efficiency is improved.

Description

Three-step seven-step method for tunnel excavation based on BIM technology
Technical Field
The invention relates to the field of computer program application, in particular to a three-step seven-step method for tunnel excavation based on a BIM (building information modeling) technology.
Background
In the BIM technology, the engineering project can be generally managed by collecting and arranging various relevant information data of the engineering project, and in the BIM project, the existing tunnel excavation construction model is divided into a plurality of units by design models or manual work and then excavation construction organization is carried out, so that the construction organization is rough. The current construction model is directly carried out according to the design model, and the construction information is not effectively butted with the design model; and there is no rendering method for rapidly forming a model. There is a great need for those skilled in the art to solve the corresponding technical problems.
Disclosure of Invention
The invention aims to at least solve the technical problems in the prior art, and particularly creatively provides a three-step and seven-step method for tunnel excavation based on a BIM (building information modeling) technology.
In order to achieve the above purpose, the invention provides a three-step seven-step method for tunnel excavation based on a BIM technology, which comprises the following steps:
s1, forming basic data information of the design construction project according to construction requirements of the construction project, and configuring relevant parameters of the project body in sequence;
s2, according to the characteristics of model subsection construction, establishing subsection constraint conditions of subsection direction, subsection path, length, deviation and rule, generating a subsection surface, and then carrying out subsection Boolean operation with an engineering design result model to obtain a series of subsection models;
s3, according to the characteristics of tunnel excavation three-step seven-step method construction, setting the initial splitting direction, configuring parameters of each size in the splitting method and rule constraint conditions, generating splitting surfaces, and then segmenting the segmentation model along the selected central line to obtain a segmentation model.
Preferably, the three-step seven-step method for tunneling based on the BIM technique, in which the step S1 includes:
s1-1, forming basic data information of the design construction project according to construction requirements of the construction project, and acquiring construction project data from an XY plane, a YZ plane and an XZ plane in sequence according to the construction requirements;
s1-2, acquiring volume data of the engineering body tunnel earthwork according to the three-dimensional direction;
and S1-3, expanding and managing according to the construction characteristics and attributes, and configuring the relevant parameters of the engineering body in sequence.
Preferably, the three-step seven-step method for tunneling based on the BIM technique, in which the step S2 includes:
s2-1, obtaining the central line and the splitting starting point of the object model in the construction engineering data;
s2-2, obtaining the sweep length H split along the central line according to the coordinate data of the construction engineering modeljObtaining a value of (d) in a direction H along the centerline subdivisionjGenerating a subdivision surface vertical to the subdivision direction of the central line through the corresponding point coordinates, and then sequentially carrying out segmentation Boolean operation with the subdivision object to obtain a segmentation result;
s2-3, performing attribute configuration on the entity of each segment, including: and assigning values according to color, transparency, construction type, personnel and time.
Preferably, the S3 includes:
s3-1, after segmentation, selecting one or more sections of the construction engineering model as blocking objects, calculating the maximum bounding box of the section swept surface of the object models along the central line direction, and splitting the blocks;
s3-2, setting three-step seven-step method blocking parameters, setting a distance H1 from the intersection of a first arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H2 from the intersection of a second arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H3 from a horizontal splitting line to the lowest point of the tunnel model, a radius R1 from the first arc line from bottom to top, a radius R2 from bottom to top of the second arc line, a length W1 of the horizontal splitting line, a parameter value of an included angle a1 between the horizontal splitting line and the oblique line, selecting a tunnel model section and a section contour, designating a tunnel model center line, and selecting two points to determine the matching direction with the splitting schematic diagram;
s3-3, constructing a splitting cutting line according to the set parameters,
from H1, R2 calculations define the following circular objects:
the radius R of the circular object C1 is R2, the center CP is (0, R2+ H1)
From H2, R1 calculations define the upper arc object:
the radius R of the circular object C2 is R1, the center CP is (0, R1+ H2)
The intermediate multi-line segment object is defined by H3, W1, a1 calculation:
from left to right, the polyline points P1 are (-tan (a1-90) H3-W1/2, 0), P2 is (-W1/2, H3), P3 is (W1/2, H3), P4 is (tan (a1-90) H3+ W1/2, 0)
Mapping a cutting line object on the cross-section swept surface calculated in the S3-1, and extending the cutting line object to the edge of the cross-section swept surface;
s3-4, sweeping the construction engineering model along the selected tunnel central line and sweeping direction by the section sweeping surface with the cutting line, splitting the block model, and numbering the block model: the upper part of the uppermost layer is numbered as 1, the lower part of the uppermost layer is numbered as 6, the left part of the middle layer is numbered as 2, the middle part of the middle layer is numbered as 7, the right part of the middle layer is numbered as 3, the left part of the lowermost layer is numbered as 4, the middle part of the lowermost layer is numbered as 8, and the right part of the lowermost layer is numbered as 5;
s3-5, the constraint input parameters of the construction engineering model are as follows:
defining the maximum bounding box height of the splitting model in a section along the tunnel centerline as H and width as W, then H1< H2< H3< H, W1< W, 90 ° < a1<180 °.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention solves the problem of how to convert a design model obtained from a design institute into a high-precision construction model which is convenient for construction units to use, namely, the BIM attribute information is managed through the established rules or constraint conditions of the industry, the construction organization units which are convenient to implement are automatically divided, the precision and the accuracy of construction management of engineering projects are improved through a tunnel model division method of excavating three steps and seven steps, and the project execution efficiency is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partitioned embodiment of the present invention;
FIG. 4 is a schematic diagram of a square partitioning embodiment of the present invention;
FIG. 5 is a schematic diagram of a diamond-shaped partition embodiment of the present invention;
fig. 6 is a general schematic of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The BIM (building Information modeling) technology in the invention is used for modeling building Information.
When the tunnel data model is imported into the BIM system, the following steps are required to be executed:
directly reading an engineering design model, and carrying out conversion analysis on a model data organization structure; forming basic data information of design construction engineering according to construction requirements of the construction engineering, and reading and importing design result models with different formats according to the construction requirements; converting and analyzing a data organization Structure of a design result model according to the mode of designing the result model by different design tools; according to the construction characteristics and the positioning, design result models of different model design tools are directly read without depending on different model design tools.
II, classifying each model data organization structure according to the characteristics of the model data organization structure, and acquiring data of each classification according to the classification, wherein the data comprise graphic data on the model organization structure and attribute data on the model organization structure; classifying each model data organization Structure according to the requirements of the data organization Structure of the construction engineering model and the characteristics of the model data organization Structure after the conversion and the analysis of the model I, wherein the classification forms are assembly Product, Part and Body; respectively acquiring attribute data and graphic data of the classified model data organization structure according to the requirements of the construction engineering model data organization structure; the construction engineering model data organization structure requirement is as follows: the sub-nodes for assembling the Product can only be assembling Product and Part nodes, the sub-nodes for Part can only be Body, wherein the assembling Product and Part nodes only represent the organizational structure of the construction engineering model tree, and the Body represents a geometric figure data under the construction engineering model data;
III, organizing a new required model organization structure according to the acquired model data organization structure and the required new model data organization structure;
IV, respectively carrying out corresponding processing on the model geometric topological body according to the obtained model data organization structure and corresponding model attribute data and model graphic data obtained after classifying the model data organization structure and according to a direct loading mode and a fast loading mode;
according to the requirements of the organizational structure of the construction engineering model data and corresponding model attribute data and model graphic data which are respectively obtained after the organizational structure of the design result model data is classified, direct loading and rapid loading are carried out aiming at two modes of importing the construction engineering model data, and the two modes are respectively processed;
according to the requirements of construction engineering model data, the geometric entity data of a design result model is required to be loaded in a direct loading mode, the geometric entity data of the design result model consists of a model geometric model and a construction geometric constraint, wherein the model geometry refers to a class pointed by a topology class and does not include specific shape information, and the construction geometry refers to a statement in the model geometry and contains actual shape information; model geometry, also called model topology, structure geometry, also called model interpretation, a cubic geometric solid representation, 1: the model geometric topology means how many blocks (a cube has only one block) in the cube geometry, how many faces (a cube has six faces) in the block, how many boundary edges (12 boundary edges) on the faces, how many points (eight points) on the boundary edges, how the points are connected with the edges, 2: the construction geometry refers to a specific surface, a specific edge (formed by which points) on the surface, a specific edge, specific point coordinates, and the construction geometry is a specific interpretation model geometric topology. The difference between the model geometry model and the structure geometry constraint in the model entity data is that the former does not include specific shape data information, and the latter includes actual shape data information.
According to the requirements of the model data of the construction engineering, the precision and model space control is needed to be carried out when the model data of the design result is directly loaded, and the precision and model space control formula for loading the model data of the design result is as follows:
setting A absolute minimum (10e-6)
B normalized minimum (10e-10)
C approximation accuracy of curved surface (10e-3)
Maximum considered zero (10e-11)
Model space calculation algorithm:
Model space＝A/B＝10e-6/10e-10＝10e4；
according to the requirements of the data of the construction engineering model, the graphic data of the design result model is required to be quickly loaded in a quick loading mode, the graphic data of the design result model does not contain pure graphic data of topology, and the graphic data representation method comprises the following steps:
set point: p1, P2, P3, P4, P5, P6
Wherein P1 is P4, P3 is P6,
point list: PList { P1x, P1y, P1z, P2x, P2y, P2z, P3x, P3y, P3z, P4x, P4y, P4z, P5x, P5y, P5z, P6x, P6y, P6z }
Face list dataset: FList { Pn1, P1, P2, P3, Pn2, P5, P4, P6}
Face + FList
Pn: number of dots
The original discrete graphics data of (2), the representation graphics is fig. 3:
the graph is a rectangle, becomes two triangles after being dispersed, complies with the right-hand rule, is outward in all normal directions, and has the optimization process as follows:
point de-weight: PList { P1x, P1y, P1z, P2x, P2y, P2z, P3x, P3y, P3z, P5x, P5y, P5z },
face deduplication dataset: FList { Pn1, P1, P2, P3, Pn2, P5, P1, P3}
And (3) reducing the number of dough sheets: for example, two quadrangles form a large quadrangle, four triangular meshes are used before optimization, two triangular meshes are used after optimization, the triangular meshes are data required by computer hardware rendering, and the lower the number of the triangular meshes is, the rendering efficiency can be improved.
Preferably, the engineering design model importing method based on the BIM technology, in which the S5 includes:
and binding the processed graphic data and the attribute data acquired in the step S4 to corresponding nodes of the organization structure of the construction engineering model data recombined in the step S3 according to the requirements of the construction engineering model data.
And V, adding the processed model graph information into each classification of the model data organization structure according to a direct loading mode and a fast loading mode.
As shown in fig. 1 to 3, the invention provides a three-step and seven-step tunnel excavation method based on a BIM technology, which comprises the following steps:
s1, forming basic data information of the design construction project according to construction requirements of the construction project, and configuring relevant parameters of the project body in sequence;
s2, according to the characteristics of model subsection construction, establishing subsection constraint conditions of subsection direction, subsection path, length, deviation and rule, generating a subsection surface, and then carrying out subsection Boolean operation with an engineering design result model to obtain a series of subsection models;
s3, according to the characteristics of tunnel excavation three-step seven-step method construction, setting the initial splitting direction, configuring parameters of each size in the splitting method and rule constraint conditions, generating splitting surfaces, and then segmenting the segmentation model along the selected central line to obtain a segmentation model.
Preferably, the three-step seven-step method for tunneling based on the BIM technique, in which the step S1 includes:
s1-1, forming basic data information of the design construction project according to construction requirements of the construction project, and acquiring construction project data from an XY plane, a YZ plane and an XZ plane in sequence according to the construction requirements;
s1-2, acquiring the volume data of the tunnel earthwork excavation engineering body according to the three-dimensional direction;
s1-3, expanding and managing according to construction characteristics and attributes, performing data configuration on the volume, the gravity center, the mass, the surface area, the dam body density and the dam body using materials of the tunnel earthwork, obtaining the maximum length, the maximum width, the maximum height, the bottom surface area, the bottom surface perimeter, the top surface area perimeter, the bottom elevation and the top elevation of the tunnel earthwork according to the tunnel earthwork building specification, and adding material filler data configuration information according to the material of the tunnel earthwork.
The data of the S1-3 needs to be sequentially acquired, so that the engineering material data required by construction can be accurately acquired, and the budget precision of the engineering project can be ensured. And the configuration contents are different for different data, so that the working method can be obtained according to continuous experiments.
Preferably, the three-step seven-step method for tunneling based on the BIM technique, in which the step S2 includes:
s2-1, obtaining the central line and the splitting starting point of the object model in the construction engineering data;
s2-2, obtaining the sweep length H split along the central line according to the coordinate data of the construction engineering modeljObtaining a value of (d) in a direction H along the centerline subdivisionjGenerating a subdivision surface vertical to the subdivision direction of the central line through the corresponding point coordinates, and then sequentially carrying out segmentation Boolean operation with the subdivision object to obtain a segmentation result; as shown in fig. 2, the base line is used as a reference line for laying rail traffic or road surface, and does not play a limiting role for the tunnel model,
s2-3, performing attribute configuration on the entity of each segment, including: and assigning values according to color, transparency, construction type, personnel and time.
Preferably, the S3 includes:
s3-1, after segmentation, selecting one or more sections of the construction engineering model as blocking objects, calculating the maximum bounding box of the section swept surface of the object models along the central line direction, and splitting the blocks;
s3-2, setting three-step seven-step method blocking parameters, setting a distance H1 from the intersection of a first arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H2 from the intersection of a second arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H3 from a horizontal splitting line to the lowest point of the tunnel model, a radius R1 from the first arc line from bottom to top, a radius R2 from bottom to top of the second arc line, a length W1 of the horizontal splitting line, a parameter value of an included angle a1 between the horizontal splitting line and the oblique line, selecting a tunnel model section and a section contour, designating a tunnel model center line, and selecting two points to determine the matching direction with the splitting schematic diagram;
and S3-3, constructing the splitting cutting line according to the set parameters and the schematic diagram as shown in fig. 2,
from H1, R2 calculations define the following circular objects:
the radius R of the circular object C1 is R2, the center CP is (0, R2+ H1)
From H2, R1 calculations define the upper arc object:
the radius R of the circular object C2 is R1, the center CP is (0, R1+ H2)
The intermediate multi-line segment object is defined by H3, W1, a1 calculation:
from left to right, the polyline points P1 are (-tan (a1-90) H3-W1/2, 0), P2 is (-W1/2, H3), P3 is (W1/2, H3), P4 is (tan (a1-90) H3+ W1/2, 0)
Mapping a cutting line object on the cross-section swept surface calculated in the S3-1, and extending the cutting line object to the edge of the cross-section swept surface;
s3-4, sweeping the construction engineering model along the selected tunnel central line and sweeping direction by the section sweeping surface with the cutting line, splitting the block model, and numbering the block model: the upper part of the uppermost layer is numbered as 1, the lower part of the uppermost layer is numbered as 6, the left part of the middle layer is numbered as 2, the middle part of the middle layer is numbered as 7, the right part of the middle layer is numbered as 3, the left part of the lowermost layer is numbered as 4, the middle part of the lowermost layer is numbered as 8, and the right part of the lowermost layer is numbered as 5; and dividing the serial numbers from small to large. The construction numbers are carried out according to the construction numbers of different positions in engineering construction, have practical operation significance, are not randomly numbered according to common general knowledge and can be realized only by paying creative labor. As shown in fig. 3, for the traditional tunnel shape, the construction operation is carried out by adopting the step of S3-4, and a tunnel data model is drawn;
after the tunnel data model is divided, automatic hooking is carried out through PBS, and the specific steps are as follows:
firstly, reading PBS data; organizing PBS data in Excel according to a data column of PBS coding, PBS description and PBS classification and reading the PBS data into a system; the imported PBS data contains column headers, where PBS encoding is the necessary data column; if the imported PBS data contains information such as attributes or engineering quantity besides PBS coding, description and classification, the information needs to be added to the corresponding PBS; no requirement is made on the order of data column organization, and the data column organization in any order supports import and identification; support single PBS introduction, and also support simultaneous introduction of PBS engineering quantities.
Secondly, mapping the data columns; performing one-to-one mapping on the data columns of the imported PBS data, such as PBS coding, PBS description and PBS classification;
thirdly, inputting a structural coding sample of each stage of the PBS; PBS coding sample support: 6 levels of engineering projects, unit projects, subsection projects, project divisions, unit projects and construction units;
any level number import is done for this PBS encoding,
the actual coding level 1 is engineering project + unit engineering;
the actual coding level 2 is engineering project + unit engineering + subsection engineering;
the actual coding level 3 is engineering project + unit project + subsection project;
the actual coding level 4 is engineering project + unit project + subsection project + project division project + unit project;
the actual coding level 5 is engineering project + unit project + subsection project + project division project + unit project + construction unit;
and in the preview function, automatically correcting the root node and setting the engineering project as the root node.
Fourthly, automatic hanging connection is carried out; automatically calculating each level of structure and automatically organizing the child-parent node relationship;
extracting a specified data column from the PBS data pool and putting the data column into an effective data pool;
sequentially acquiring six levels of sample codes of engineering projects, unit projects, subsection projects, project divisions, unit projects and construction units; and resolving the coding placeholder according to the coding sample, wherein the algorithm is as follows:
setting the current Code of the PBS Code column as Cur _ Code, and setting the Next Code of the PBS Code column as Next _ Code;
then the PBS encoded column is traversed if Cur _ Code _ Len! If the placeholder replace character is an empty character string, the number of bits of each level of coding in PBS coding is different, wherein Cur _ Code _ Len is the length of the former coding character string, and Next _ Code _ Len is the length of the latter coding character string;
if the Cur _ Code _ Len is equal to Next _ Code _ Len, then the PBS codes are equipotential, and the number of coded bits of each level of the PBS codes is the same, and for the number of bits insufficient for each level, a certain specific placeholder is used as a complement, for example, 0; each character encoded in PBS is traversed at this time: setting: in the same position J, the character of the Cur _ Code is Cur _ Code _ C, and the character of the Next _ Code is Next _ Code _ C; if Cur _ Code _ C! Next _ Code _ C, which is the placeholder ReplaceChar; analyzing the number of the coding bits of each level of the PBS coding sample; and resolving the coding placeholder according to the coding sample, wherein the algorithm is as follows: if the placeholder RelaceCharr is an empty string, the number of coding bits at each stage is the number of actual coding sample cases; if the placeholder RelaceChar is not an empty string, the number of bits of the placeholder needs to be removed from each level of coding sample; sequentially searching and matching PBS codes from the top layer to the bottom layer according to the placeholder and each level of digits, searching a father node fNode, organizing the attribute and other data of the father node fNode, and binding the attribute and other data of the father node fNode with the PBS codes; searching a next-level node set vChildren of the father node, and hanging the vChildren under the fNode; finishing the searching and matching until the searched subset vChildren is empty;
fifthly, previewing the PBS structure; providing a preview function for the hooked PBS structure.
And (3) exporting the tunnel data model which is hung and connected by the PBS, and specifically executing the following steps:
selecting an engineering construction model export format and a version corresponding to the engineering construction model export format;
traversing the data organization structure of the engineering construction model according to the selected engineering construction model, and classifying the data organization structure of the engineering construction model in the modes of Product assembly, Part parts and Body;
organizing a new required model organization structure according to the acquired project construction model data organization structure and the required new model data organization structure;
filling the obtained model data organization structures and the corresponding model attribute data and the model graph entity B-Rep data which are obtained after the model data organization structures are classified into the corresponding engineering construction model data organization structures respectively; respectively filling corresponding model attribute data and model graph B-Rep data which are respectively obtained after the organizational structure of the model data of the design result is classified into each classification node of the organizational structure of the corresponding engineering construction model data according to the requirements of the organizational structure of the construction engineering model data; according to the requirements of construction engineering model data, an engineering construction model and geometric entity data of a design result model are composed of a model geometric model and a construction geometric constraint, wherein the model geometry refers to a class pointed by a topology class and does not include specific shape information, the construction geometry refers to a statement in the model geometry and includes actual shape information, and the relationship between the model geometry and the construction geometry is as follows: wherein the abstract geometry corresponds to the model geometry and the concrete geometry corresponds to the construction geometry; according to the requirements of the construction model data, the derivation of the construction model data needs to be controlled in precision and model space, and the precision and model space control formula of the derivation of the construction model data is as follows:
setting A: absolute minimum (10e-6)
B: normalized minimum (10e-10)
C: approximation precision of curved surface (10e-3)
D: maximum considered to be zero (10e-11)
Model space calculation algorithm:
Model space＝A/B＝10e-6/10e-10＝10e4。
thirdly, according to the selected export format of the engineering construction model and the corresponding version of the export format, exporting the obtained engineering construction model data organization structure, the engineering construction model attribute data on each classification structure and the graph B-Rep data.
As shown in fig. 4 and 5, a simulation experiment is also performed in the specific execution operation of the square tunnel or the prismatic tunnel, and the execution operation is performed by using the step S3-4 for the new tunnel model, but in the execution process of the three-step and seven-step method, the splitting process is completely consistent, and finally, a corresponding effect can be achieved, and for the future conversion of the tunnel shape according to different construction schemes, when the three-step and seven-step method is used, the rapid splitting of the model is similarly achieved, so that the practical tunnel construction engineering is obviously guided.
S3-5, the constraint input parameters of the construction engineering model are as follows:
defining the maximum bounding box height of the splitting model in a section along the tunnel centerline as H and width as W, then H1< H2< H3< H, W1< W, 90 ° < a1<180 °. According to experiment and engineering data, the angle a1 is selected to be guaranteed to be larger than 90 degrees, if the angle a1 is selected to be 90 degrees, the collapse risk in the actual engineering process can be caused, meanwhile, according to analysis of specific embodiments of fig. 3, 4 and 5, vertical data H are collected firstly, then horizontal data W are collected, and therefore data collection can be carried out orderly, engineering data are rich in conditioning.
As shown in fig. 6, in the building information management BIM technique, in order to implement mutual identification authentication between construction work data and machines in the data model building process for tunnel construction work in particular, therefore, the operation of importing the model to the tunnel data model is needed, the model is imported into the BIM system for processing, the tunnel model is split and planned according to different actual construction conditions, a dividing means for different tunnel models is formed, thereby improving the efficiency of tunnel construction engineering, after the tunnel model is divided, by the PBS structure automatic hanging method, constructing the tunnel data model and arranging the data names, exporting the tunnel data model after construction and arrangement of the data names, the description shows the working link of the PBS in the whole BIM, and has important guiding significance for tunnel model division in construction.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (3)

1. A three-step seven-step tunnel excavation method based on a BIM technology is characterized by comprising the following steps:
s1, forming basic data information of the design construction project according to construction requirements of the construction project, and configuring relevant parameters of the project body in sequence;
s2, according to the characteristics of model subsection construction, establishing subsection constraint conditions of subsection direction, subsection path, length, deviation and rule, generating a subsection surface, and then carrying out subsection Boolean operation with an engineering design result model to obtain a series of subsection models;
s3, according to the characteristics of tunnel excavation three-step seven-step construction, setting the initial splitting direction, configuring parameters of each size in the splitting method and rule constraint conditions, generating splitting surfaces, and then segmenting the segmented model along the selected central line to obtain a segmented model;
the S3 includes:
s3-1, after segmentation, selecting one or more sections of the construction engineering model as blocking objects, calculating the maximum bounding box of the section swept surface of the object models along the central line direction, and splitting the blocks;
s3-2, setting three-step seven-step method blocking parameters, setting a distance H1 from the intersection of a first arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H2 from the intersection of a second arc line and a tunnel model center line from bottom to top of the tunnel model to the lowest point of the tunnel model, a distance H3 from a horizontal splitting line to the lowest point of the tunnel model, a radius R1 from the first arc line from bottom to top, a radius R2 from bottom to top of the second arc line, a length W1 of the horizontal splitting line, a parameter value of an included angle a1 between the horizontal splitting line and the oblique line, selecting a tunnel model section and a section contour, designating a tunnel model center line, and selecting two points to determine the matching direction with the splitting schematic diagram;
s3-3, constructing a splitting cutting line according to the set parameters,
by H1, R2 calculation defines circular object C1 and circular object C2:
the radius R of the circular object C1 is R2, the center CP is (0, R2+ H1)
From H2, R1 calculations define the upper arc object:
the radius R of the circular object C2 is R1, the center CP is (0, R1+ H2)
The intermediate multi-line segment object is defined by H3, W1, a1 calculation:
from left to right, the polyline points P1 are (-tan (a1-90) × H3-W1/2, 0), P2 is (-W1/2, H3), P3 is (W1/2, H3), and P4 is (tan (a1-90) × H3+ W1/2, 0);
mapping a cutting line object on the section swept surface calculated in the S3-1, and extending the cutting line object to the edge of the section swept surface;
s3-4, sweeping the construction engineering model along the selected tunnel central line and sweeping direction by the section sweeping surface with the cutting line, splitting the block model, and numbering the block model: the upper part of the uppermost layer is numbered as 1, the lower part of the uppermost layer is numbered as 6, the left part of the middle layer is numbered as 2, the middle part of the middle layer is numbered as 7, the right part of the middle layer is numbered as 3, the left part of the lowermost layer is numbered as 4, the middle part of the lowermost layer is numbered as 8, and the right part of the lowermost layer is numbered as 5;
s3-5, the constraint input parameters of the construction engineering model are as follows:
h1 is formed by defining the height of the maximum bounding box of the splitting model in the section along the central line of the tunnel as H and the width as W<H2<H3<H，W1<W，90o<a1<180o。
2. The BIM technology-based three-step seven-step tunnel excavation method of claim 1, wherein the S1 comprises:
s1-1, forming basic data information of the design construction project according to construction requirements of the construction project, and acquiring construction project data from an XY plane, a YZ plane and an XZ plane in sequence according to the construction requirements;
s1-2, acquiring volume data of the engineering body tunnel earthwork according to the three-dimensional direction;
and S1-3, expanding and managing according to the construction characteristics and attributes, and configuring the relevant parameters of the engineering body in sequence.
3. The BIM technology-based three-step seven-step tunnel excavation method of claim 1, wherein the S2 comprises:
s2-1, obtaining the central line and the splitting starting point of the object model in the construction engineering data;
s2-2, obtaining the sweep length split along the central line according to the coordinate data of the construction engineering modelH j Obtaining a value of (d) in a direction of subdivision along the centerlineH j Generating a subdivision surface vertical to the subdivision direction of the central line through the corresponding point coordinates, and then sequentially carrying out segmentation Boolean operation with the subdivision object to obtain a segmentation result;
s2-3, performing attribute configuration on the entity of each segment, including: and assigning values according to color, transparency, construction type, personnel and time.
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