CN113217106A - Three-dimensional modeling method for oblique cut tunnel portal - Google Patents
Three-dimensional modeling method for oblique cut tunnel portal Download PDFInfo
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- CN113217106A CN113217106A CN202110591356.7A CN202110591356A CN113217106A CN 113217106 A CN113217106 A CN 113217106A CN 202110591356 A CN202110591356 A CN 202110591356A CN 113217106 A CN113217106 A CN 113217106A
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- 239000007787 solid Substances 0.000 claims abstract description 7
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- 230000001131 transforming effect Effects 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 238000009958 sewing Methods 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
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Abstract
The invention relates to the field of three-dimensional modeling, and provides a three-dimensional modeling method of an oblique cut tunnel portal in order to improve the modeling efficiency and the modeling precision of the tunnel portal, which comprises the following steps: step 1, establishing a tunnel body model of a tunnel portal section; step 2, obtaining modeling parameters of the oblique cut type tunnel portal; step 3, obtaining a lower contour line of the internal mold of the brim and a lower contour line of the external mold of the brim according to the modeling parameters and the body model of the portal section; step 4, obtaining an upper contour line of the internal mold of the brim and an upper contour line of the external mold of the brim according to the lower contour line of the internal mold of the brim, the lower contour line of the external mold of the brim and the modeling parameters; and 5, solid stitching. The three-dimensional modeling is carried out by adopting the steps without carrying out the die overturning operation, so that the precision is higher and the efficiency is better.
Description
Technical Field
The invention relates to the field of three-dimensional modeling, in particular to a three-dimensional modeling method for an oblique cut tunnel portal.
Background
With the deep application and development of the BIM technology in the field of infrastructure, how to effectively improve the efficiency and precision of three-dimensional modeling is more and more widely regarded. The microscopic of Bentley company is a three-dimensional modeling software which has strong functions and can serve the civil construction industry, but because Bentley series software has weaker self-parameterization function, BIM modeling personnel can only carry out modeling in a traditional mode of rollover at present, namely three-dimensional reconstruction is carried out by utilizing two-dimensional drawings, the model reuse rate is low, the modification is troublesome, the efficiency is low, and the precision is not high. The oblique cut tunnel portal mainly comprises a cap brim and a portal body, wherein the cap brim is an elliptical table formed by four elliptical curves (a lower contour line of an inner cap brim mold, a lower contour line of an outer cap brim mold, an upper contour line of the inner cap brim mold and an upper contour line of the outer cap brim mold).
Disclosure of Invention
The invention provides a three-dimensional modeling method for an oblique cut tunnel portal, aiming at improving the modeling efficiency and the modeling precision of the oblique cut tunnel portal.
The technical scheme adopted by the invention for solving the problems is as follows:
a three-dimensional modeling method of a chamfered tunnel portal comprises the following steps:
and 5, solid stitching.
Further, the modeling parameters in the step 2 include a slope parameter of an upper contour line of the cap brim inner mold, a slope parameter of an upper contour line of the cap brim outer mold, a slope parameter of a lower contour line of the cap brim inner mold, a slope parameter of a lower contour line of the cap brim outer mold, and a base point of the oblique cut type hole door.
Further, the step 3 comprises:
step B1, translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the internal mold of the brim to obtain the plane where the lower contour line of the internal mold of the brim is located, and translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the external mold of the brim to obtain the plane where the lower contour line of the external mold of the brim is located;
and step B2, respectively using the plane where the lower contour line of the internal brim model is located and the plane where the lower contour line of the external brim model is located to intercept the hole body model of the hole section based on Boolean operation so as to obtain the lower contour line of the internal brim model and the lower contour line of the external brim model.
Further, the step 3 comprises:
step B1, translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the internal mold of the brim to obtain the plane where the lower contour line of the internal mold of the brim is located, and translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the external mold of the brim to obtain the plane where the lower contour line of the external mold of the brim is located;
step B2, respectively stretching the plane of the lower contour line of the internal mold of the brim and the plane of the lower contour line of the external mold of the brim into a cubic entity along the corresponding normal direction;
and step B3, respectively intercepting the opening section and body model by using a cube entity based on Boolean operation to obtain the lower contour line of the internal mold of the brim and the lower contour line of the external mold of the brim.
Further, the step 4 comprises:
step C1, stretching the lower contour line of the internal mold of the brim and the lower contour line of the external mold of the brim in the tangent plane normal direction of the lower contour line of the internal mold of the brim and the external mold of the brim respectively to obtain two stretching curved surfaces x and y;
and C2, intercepting x according to the inclined plane corresponding to the slope parameter of the profile on the internal mold of the brim to obtain the profile on the internal mold of the brim, and intercepting y according to the inclined plane corresponding to the slope parameter of the profile on the external mold of the brim to obtain the profile on the external mold of the brim.
Further, the step B1 is preceded by the step a1 of translating the hole portal body model to the origin.
Further, the step a1 further includes performing a thumbnail transformation on the hole portal body model.
And furthermore, the step 4 of obtaining the upper contour line of the cap brim inner die and the upper contour line of the cap brim outer die further comprises the step D of carrying out reduction transformation on the hole body model of the hole portal section.
Further, a thumbnail transformation and a reduction transformation are performed by a Transform function.
Compared with the prior art, the invention has the beneficial effects that: when oblique cut tunnel portal modeling is carried out, a three-dimensional portal section body model is directly established, Boolean subtraction operation is carried out on the surface or formed cube of the relevant parameters and the portal section body model to directly obtain a lower outline of a cap brim internal mold and a lower outline of a cap brim external mold required for establishing the cap brim, and then a cap brim internal mold upper outline and a cap brim external mold upper outline required for establishing the cap brim are obtained through the cap brim internal mold lower outline and the cap brim external mold lower outline, so that modeling precision is improved, a mold overturning step is not needed, and modeling efficiency is improved.
Drawings
FIG. 1 is a flow chart of the three-dimensional modeling of the present invention;
FIG. 2 is a schematic structural view of a chamfered portal;
FIG. 3 is a schematic structural diagram of a section of a plane where a lower contour line of the internal mold of the brim is located and a hole body model of a hole door section;
reference numerals: 1. the lower contour line of the cap brim inner mold, 2, the upper contour line of the cap brim inner mold, 3, the upper contour line of the cap brim outer mold, and 4, the lower contour line of the cap brim outer mold.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 2, the oblique cut type hole door mainly comprises a brim and a hole body, and the brim mainly comprises an upper contour line of an inner brim mold, an upper contour line of an outer brim mold, a lower contour line of the inner brim mold and a lower contour line of the outer brim mold.
As shown in fig. 1, a three-dimensional modeling method of a chamfered tunnel portal includes:
and 5, solid stitching.
Specifically, step 1, creating a tunnel portal body model: in the present embodiment, a cave entrance segment cave body model is created based on Visual Studio using the language C #: loading a command stream for creating the tunnel portal through an mdl command, selecting a circuit and a tunnel body model from an dgn file, acquiring a line position and a tunnel body parameter of the tunnel body section model, storing data in an oblique-cut tunnel portal parameter class, and creating the tunnel portal section tunnel body model according to the oblique-cut tunnel portal parameter class; the line comprises the information of mileage, elevation, space positioning points and the like of the hole body.
Section of surface from body: as shown in fig. 3, the description will be given by taking an example of obtaining the lower contour line of the visor inner mold. The base points of the chamfered hole gates are subjected to coordinate translation transformation to obtain p1, p2, p3, p4, p5 and p6, wherein the line segments p1p2// p3p6// p4p 5. p1p2 is a horizontal line on the plane where the hole is located in the hole body model of the hole door section, the distance between the lower contour line of the internal mold of the brim and the hole can be determined according to the base point of the oblique-cutting hole door, so that p3p6 can be obtained, p3 and p6 are two end points of the lower contour line of the internal mold of the brim, p4p5 can be obtained according to the slope parameter of the lower contour line of the internal mold of the brim, and the plane where the lower contour line of the internal mold of the brim is located can be determined according to p3, p4, p5 and p 6; and intercepting the plane where the lower contour line of the internal mold of the brim is located with the hole body model of the hole portal section based on Boolean operation, wherein the corresponding intercept line is the lower contour line of the internal mold of the brim. The obtaining mode of the lower contour line of the external mold of the brim is the same as that of the lower contour line of the internal mold of the brim.
Body-to-body section: obtaining a plane where a lower contour line of the internal mold of the brim is located by adopting a surface-to-body cutting mode, and stretching the plane along the normal direction of the plane into a cubic entity; and based on Boolean operation, a cubic entity is used for intercepting the tunnel body model of the tunnel door section so as to obtain the lower contour line of the internal mold of the brim. The obtaining mode of the lower contour line of the external mold of the brim is the same as that of the lower contour line of the internal mold of the brim. The Boolean operation efficiency is higher when the body-to-body phase-cutting is adopted.
After Boolean operation, numbering all contour lines of the cut tunnel portal section tunnel body model respectively through a numbering tool; and acquiring a corresponding contour line according to the number so as to ensure that the contour line extracted each time is a required specific contour line.
And 5, solid sewing, namely sewing all the contour lines into a solid model. Firstly, a curved surface is generated by a curve, and then a solid model is generated by sewing the curved surface. Furthermore, additional processes and material attributes can be added to the entity model, attributes such as volume and area of the entity model can be extracted, and statistics can be carried out according to the processes and the materials in a classified mode.
In addition, during the use process, the inventor finds that the Boolean operation of the Microstation software is limited to the range with the coordinates of +/-500 m, and random errors can occur in the Boolean operation exceeding the range with the coordinates of +/-500 m. To address this problem, a solution is proposed: and (4) performing translation transformation on the entity performing the Boolean operation in the step (3) through a Transform function, and translating the entity to the origin. And if the model range exceeds +/-500 m, carrying out the abbreviative transformation, and after the Boolean operation is finished, carrying out the reduction transformation by a Transform function.
Claims (9)
1. A three-dimensional modeling method for a chamfered tunnel portal is characterized by comprising the following steps:
step 1, establishing a tunnel body model of a tunnel portal section;
step 2, obtaining modeling parameters of the oblique cut type tunnel portal;
step 3, obtaining a lower contour line of the internal mold of the brim and a lower contour line of the external mold of the brim according to the modeling parameters and the body model of the portal section;
step 4, obtaining an upper contour line of the internal mold of the brim and an upper contour line of the external mold of the brim according to the lower contour line of the internal mold of the brim, the lower contour line of the external mold of the brim and the modeling parameters;
and 5, solid stitching.
2. The three-dimensional modeling method for the chamfered tunnel portal according to claim 1, wherein the modeling parameters in step 2 include a slope parameter of an upper contour line of the internal mold of the visor, a slope parameter of an upper contour line of the external mold of the visor, a slope parameter of a lower contour line of the internal mold of the visor, a slope parameter of a lower contour line of the external mold of the visor, and a base point of the chamfered tunnel portal.
3. The method for three-dimensional modeling of a mitered tunnel portal according to claim 2, wherein said step 3 comprises:
step B1, translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the internal mold of the brim to obtain the plane where the lower contour line of the internal mold of the brim is located, and translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the external mold of the brim to obtain the plane where the lower contour line of the external mold of the brim is located;
and step B2, respectively using the plane where the lower contour line of the internal brim model is located and the plane where the lower contour line of the external brim model is located to intercept the hole body model of the hole section based on Boolean operation so as to obtain the lower contour line of the internal brim model and the lower contour line of the external brim model.
4. The method for three-dimensional modeling of a mitered tunnel portal according to claim 2, wherein said step 3 comprises:
step B1, translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the internal mold of the brim to obtain the plane where the lower contour line of the internal mold of the brim is located, and translating and transforming the base point of the oblique cutting type hole door according to the slope parameter of the lower contour line of the external mold of the brim to obtain the plane where the lower contour line of the external mold of the brim is located;
step B2, respectively stretching the plane of the lower contour line of the internal mold of the brim and the plane of the lower contour line of the external mold of the brim into a cubic entity along the corresponding normal direction;
and step B3, respectively intercepting the opening section and body model by using a cube entity based on Boolean operation to obtain the lower contour line of the internal mold of the brim and the lower contour line of the external mold of the brim.
5. The method for three-dimensional modeling of a mitered tunnel portal according to claim 2, wherein said step 4 comprises:
step C1, stretching the lower contour line of the internal mold of the brim and the lower contour line of the external mold of the brim in the tangent plane normal direction of the lower contour line of the internal mold of the brim and the external mold of the brim respectively to obtain two stretching curved surfaces x and y;
and C2, intercepting x according to the inclined plane corresponding to the slope parameter of the profile on the internal mold of the brim to obtain the profile on the internal mold of the brim, and intercepting y according to the inclined plane corresponding to the slope parameter of the profile on the external mold of the brim to obtain the profile on the external mold of the brim.
6. The method for three-dimensional modeling of a chamfered tunnel portal according to claim 3 or 4, wherein the step B1 is preceded by a step A1 of translating the portal section body model to the origin.
7. The method for three-dimensional modeling of a chamfered tunnel portal according to claim 6, wherein the step A1 further comprises a thumbnail transformation of the portal section body model.
8. The three-dimensional modeling method for the chamfered tunnel portal according to claim 7, wherein the step 4 further comprises a step D of performing reduction transformation on the portal section body model after acquiring the internal brim mold contour line and the external brim mold contour line.
9. The method for three-dimensional modeling of a chamfered tunnel portal according to claim 7 or 8, wherein the abbreviating transformation and the reducing transformation are performed by Transform function.
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