A modeling method for parametric model of circular arch straight wall top arch component

Abstract

The present invention discloses a modeling method for a parametric model of a circular arch straight wall type top arch component, comprising the following steps: creating a model of the circular arch straight wall type top arch; defining input parameters of the model graphics and logical operation parameters between the input parameters, wherein the logical operation parameters are used to implement constraint relationships between geometric figures constituting the model; and defining model output quantities of the model, wherein the model output quantities include: model volume, top arch segment surface area, related support quantity, and excavation quantity. According to the above technical solution, the "family" function of Rev it software can be used to complete the creation of a parametric three-dimensional model of a circular arch straight wall type top arch component of an underground cavern. By secondary processing of the BIM model information, automatic statistics of related engineering quantities can be achieved, thereby solving the problems of low efficiency in family modeling of irregular cavern top arch types and low application of model information in Rev it software.

Description

Technical Field

[0001] The present invention belongs to the technical field of BIM for hydropower and water conservancy projects, and in particular relates to a modeling method for a parametric BIM model of a round arch straight wall type top arch component on a Revit platform. Background Art

[0002] In hydropower and water conservancy projects, underground powerhouse cavern projects are a common construction project. However, due to the influence of factors such as geological conditions and construction methods, the arch excavation structure has a large span, different geometric dimensions, different support materials and types, and many non-standard components. The workload of model establishment and information addition is huge. Therefore, it is necessary to parametrically create the cavern arch information model. Based on the 3D design software, a series of parameters and rules are used to drive the generation of the 3D model, so that the model can be automatically updated according to changes in related engineering content, speeding up the modeling speed and improving the degree of standardization.

[0003] Revit is currently a mainstream BIM software with functions such as data compatibility, parametric modeling, and secondary development. In the Revit platform, model building is completed by creating instances of various component families. Parametric modeling is mainly achieved by creating families with geometric dimensions, materials, operation and maintenance information. The shape of structural components can be changed by changing the control parameters of the family model, thereby achieving rapid modeling and application. The "Design Code for Underground Powerhouses of Hydropower Stations" (NB / T 35090-2016) clearly states that the cross-section of the main powerhouse and the main transformer tunnel should adopt a circular arch straight wall shape. The top arch rise-span ratio of the circular arch straight wall section needs to be determined in combination with the surrounding rock conditions and the rock strength stress ratio, and the top arch seat needs to be rounded. The circular arch straight wall shape is a type of tangent three arc segments and the lower part is tangent to the vertical straight line. The curve design is relatively complex. The following problems exist in the process of establishing a circular arch straight wall information model on the Revit platform:

[0004] (1) The Revit platform does not include a component family for underground cavern arches that is consistent with specifications and engineering experience. The model family library provided by the software cannot meet the BIM model requirements for underground engineering structures. Therefore, it is necessary to create underground cavern arch straight wall components suitable for various sizes based on the general family model category to ensure the versatility of the components.

[0005] (2) The arch type of an underground cavern is generally formed through excavation, support, and other measures. It is necessary to calculate the engineering quantities during the construction process. However, Revit software can only calculate the engineering quantities of the established solid model, and the related excavation and support quantities cannot be directly output. Therefore, it is necessary to establish the relationship between the model excavation quantity, support quantity, and arch component parameters to accurately and efficiently output this part of the engineering quantity. Summary of the Invention

[0006] To achieve the above objectives, the present application provides a method for modeling a parametric model of a circular arch straight wall type top arch component, comprising the following steps:

[0007] Creating a circular arch straight wall arch model involves defining the model's corresponding family category, material type, and name, selecting the corresponding REVIT function, and generating the corresponding arch structure. The arch structure consists of two straight walls and three inscribed circular arches, with the left and right arch centers on the same horizontal line and the center of the middle arch on the perpendicular bisector of the line connecting the left and right arch centers.

[0008] Define the logical operation parameters of the model. The logical operation parameters are used to calculate the constraint relationship between the geometric figures that constitute the model using basic parameters; the geometric figures are controlled by the graphic input parameters;

[0009] Define the model output of the model, which includes: model volume, top arch surface area, related support volume, and excavation volume.

[0010] Among them, the selected REVIT corresponding functions include the lofting function, the corresponding outline is a rectangle, and the lofting path is the spatial geometric structure corresponding to the circular arch structure.

[0011] The basic parameters of the profile include: the length of the round arch straight wall component, the thickness of the sprayed concrete;

[0012] The parameters of the lofting path include: component width, vertical wall height, middle large arch radius, and left and right small arch radius.

[0013] Furthermore, the logical operation parameters include: the difference between the radius of the large and small arches, the rise height of the central large arch, the total height of the structure, the horizontal length of the central arch, the arc length of the central arch, and the arc lengths of the left and right arches. The logical operation parameters are calculated based on the graphical input parameters. The calculation method includes:

[0014] The formula for calculating the difference in radius between the large and small arches is: ΔR = R1 - R2, where ΔR is the difference in radius between the large and small arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches.

[0015] The calculation formula for the rise of the central large circular arch is:

[0016]

[0017] Among them, H s is the sagittal height of the central arch, ΔR is the difference in radius between the large and small arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches;

[0018] The formula for calculating the total height of the structure is:

[0019]

[0020] Among them, H is the total height of the structure, H w is the height of the vertical wall, H s is the central arch height, B is the arch width;

[0021] The formula for calculating the horizontal length of the central arch is: D = 2 × (R1 2 -(R1-H s ) 2 ), where D is the length of the central arch, R1 is the radius of the middle large arch, and H s The central arch height;

[0022] The calculation formula for the arc length of the central arch is:

[0023]

[0024] Among them, S1 is the length of the central arch, R1 is the radius of the middle large arch, H s The central arch height;

[0025] The calculation formula for the arc length of the left and right small arches is:

[0026]

[0027] Among them, S2 is the arc length of the left and right arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches.

[0028] Furthermore, the calculation method of the logical operation parameters also includes a verification method of the basic parameter numerical input, including:

[0029] Calculate the rise-to-span ratio of the top arch design model and determine whether the rise-to-span ratio complies with the specification;

[0030] The calculation method of rise-span ratio is: K = (HH W ) / B, where K is the rise-span ratio, H is the total height of the structure, and H w A is the height of the straight wall and B is the width of the arch.

[0031] Furthermore, the family category of the model is General, the material type is Cast-in-place Concrete, and the name is Round Arch Straight Wall Top Arch_H w / B_Spray mix thickness δ.

[0032] Furthermore, the model output parameters include: the number of support anchors, the excavation volume of the arch straight wall section, and the calculation method includes:

[0033] The calculation method for the number of support anchor rods is:

[0034] Where N is the number of anchor rods, a and b are the spacing and row spacing of anchor rods, and H is the spacing of anchor rods. w is the height of the straight wall, S1 is the arc length of the central arch, S2 is the arc length of the left and right arches, and L is the length of the arch straight wall;

[0035] The calculation method for the excavation volume of the circular arch straight wall section is:

[0036] Among them, M is the excavation volume of the circular arch straight wall, B is the width of the circular arch, and H is the total height of the structure.

[0037] The number of anchor rods also includes the number of anchor rods after deducting the support area of the straight wall section. The calculation method is:

[0038] Where N is the number of anchor rods, a and b are the spacing and row spacing of anchor rods, S1 is the arc length of the central arch, S2 is the arc length of the left and right arches, and L is the length of the arch straight wall.

[0039] Furthermore, the corresponding functions of the REVIT software also include a stretching function. The cross-section corresponding to the stretching function is the geometric structure corresponding to the circular arch structure. The stretching direction corresponding to the stretching function is the normal direction of the plane where the cross-section is located; the stretching length is the length of the straight wall.

[0040] The basic parameters of the section include: thickness of shotcrete, width of arch, height of vertical wall, radius of middle large arch, radius of left and right small arches;

[0041] The basic parameters of the stretching path include: the length of the circular arch straight wall component.

[0042] According to the present invention, the creation of a parameter-driven BIM model of a circular arch straight wall type top arch component is realized. By modifying the basic input parameters, the circular arch straight wall model of an underground cavern can be accurately and quickly created. On the other hand, through the parameterized BIM model, a calculation relationship between each basic input parameter and the amount of sprayed concrete, support and excavation of the circular arch straight wall section is established, thereby achieving a seamless connection from the model to the output engineering quantity. The calculation results are highly accurate and can meet the usage requirements in various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a step diagram of a modeling method based on the Revit platform provided according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the lofting modeling principle based on the Revit platform provided according to an embodiment of the present invention;

[0045] Figure 3 1 is a schematic diagram of parameters of a lofting modeling process provided by an embodiment of the present invention;

[0046] Figure 4 1 is a schematic diagram of model output according to a modeling method based on the Revit platform provided in an embodiment of the present invention;

[0047] Figure 5 Schematic diagram of the stretching modeling principle based on the Revit platform provided according to an embodiment of the present invention;

[0048] Figure 6 2 is a schematic diagram of parameters of a stretching modeling process provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The present invention provides a modeling method for constructing a BIM model of an underground cavern round arch straight wall top arch based on the Revit platform. The method uses the "family" function of the Revit software to complete the creation of a parametric three-dimensional model of the underground cavern round arch straight wall top arch component. By controlling the spatial size parameters of the model, the parametric design of the BIM model of the underground cavern round arch straight wall top arch is realized. Through secondary processing of the BIM model information, the automatic statistics of related engineering quantities are realized, and the problems of low efficiency in family modeling of irregular cavern top arch types and low application of model information in the Revit software are solved.

[0050] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings.

[0051] Figure 1 A step diagram of the modeling method of this application is provided, as shown in the figure, including the following contents:

[0052] Step S100: Create a model of a circular arch straight wall type top arch, including: defining the family category, material type, and name corresponding to the model, selecting the corresponding REVIT function, and generating the top arch structure corresponding to the model; the top arch structure is a certain thickness of concrete sprayed on the rock surface after the top arch of the underground project is excavated. The top arch structure in this application includes two straight walls and three inscribed circular arches. The centers of the left and right circular arches are on the same straight line, and the center of the middle circular arch is on the perpendicular bisector of the line connecting the centers of the left and right circular arches; Figure 3 As shown, the centers O2 and O3 of the left and right arches are on the same straight line, and the center O1 of the middle arch is on the perpendicular bisector of the line segment connecting O2 and O3.

[0053] During the implementation process, this application provides two REVIT corresponding functions to realize modeling.

[0054] The first method is to use the lofting function (step S101):

[0055] Select the "lofting" method provided in the Revit "Family" function to create it. The lofting method requires providing the software with the "contour" and "lofting path".

[0056] Specific as Figure 2 As shown, the outline of the model is determined to be a rectangle, and the lofting path is two straight walls and three inscribed circular arches.

[0057] Figure 2 P210 is a schematic diagram of the outline and the lofting path, where P211 indicates that the outline is a rectangle, P213 indicates the length L of the circular arch straight wall, P212 is the lofting path, and the arrow indicates the lofting direction. As shown in the figure, the lofting path is a three-segment inscribed circular arch; P214 is the thickness δ of the shotcrete;

[0058] After performing the layout processing according to the layout path shown in Figure P210, the model structure shown in Figure P220 is generated.

[0059] The modeling process generates basic parameters such as Figure 3 As shown in the figure, the basic parameters of the profile include the length of the arch wall L; the thickness of the sprayed concrete δ; the basic parameters of the layout path include the arch width B, the height of the straight wall H w , the radius of the large arch in the middle is R1, and the radius of the small arches on the left and right sides is R2.

[0060] The second method is to use the stretching function (step S102):

[0061] Select the "Extrusion" method provided in the Revit "Family" function to create it.

[0062] Specific as Figure 5 As shown, first determine the cross section corresponding to the stretching to be the geometric structure corresponding to the circular arch structure, such as Figure 5 As shown on P512, its cross section is a three-segment inscribed circular arch. P513 indicates that the corresponding stretching direction is the normal direction of the plane in which the cross section lies. The stretching length is the length of the straight wall, such as the length of the rectangle shown on P511. After stretching according to the stretching path shown on P510, the resulting structure is the model structure shown on P520.

[0063] The basic parameters of the section include: the thickness of the sprayed concrete δ, the arch width B, the height of the vertical wall H w , the radius of the middle large arch is R1, and the radius of the left and right small arches is R2;

[0064] The basic parameters of the stretching path include: the length L of the arch straight wall.

[0065] Step S110: define the logical operation parameters of the model:

[0066] The logical operation parameters are used to realize the constitutive elements of this model, that is, the constraint relationship between geometric figures. The realization process is realized by calculating the basic parameters of the model. In this application, the constituent elements of the arch straight wall type top arch include at least three arcs and two straight lines, such as Figure 3 、 Figure 6 geometric figures.

[0067] Logical operation parameters such as Figure 3 As shown, including: the radius difference ΔR of the large and small arches, the center arch height H s , total height of structure H, horizontal length of central arch D, arc length of central arch S1, arc length of left and right arches S2. The calculation process of the above logical operation parameters requires the input of basic parameters for calculation.

[0068] The specific calculation methods include:

[0069] 1) The calculation formula for the difference in radius between the large and small arches is:

[0070] ΔR=R1-R2, where ΔR is the difference in radius between the large and small arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches;

[0071] 2) The calculation formula for the central large circular arch rise is:

[0072]

[0073] Among them, H s is the sagittal height of the central arch, ΔR is the difference in radius between the large and small arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches;

[0074] 3) The formula for calculating the total height of the structure is:

[0075]

[0076] Among them, H is the total height of the structure, H w is the height of the vertical wall, H s is the central arch height, B is the arch width;

[0077] 4) The calculation formula for the horizontal length of the central arch is:

[0078] D=2×(R1 2 -(R1-H s ) 2 ), where D is the length of the central arch, R1 is the radius of the middle large arch, and H s The central arch height;

[0079] 5) The calculation formula for the arc length of the central arch is:

[0080]

[0081] Among them, S1 is the length of the central arch, R1 is the radius of the middle large arch, H s The central arch height;

[0082] 6) The calculation formula for the arc length of the left and right small arches is:

[0083]

[0084] Among them, S2 is the arc length of the left and right arches, R1 is the radius of the middle large arch, and R2 is the radius of the left and right small arches.

[0085] Since this step achieves the shape of a circular arch with straight walls by changing the control parameters of the family model, the result must comply with the requirements of the "Code for Design of Underground Powerhouses of Hydropower Stations" (NB / T 35090-2016). Therefore, it is necessary to verify whether the calculation results of the logical operation parameters meet the standards. The specific implementation process is to input the basic parameter values to calculate the rise-to-span ratio of the top arch design model and determine whether the rise-to-span ratio meets the standards.

[0086] The calculation method of the rise-to-span ratio is:

[0087] K=(HH W ) / B, where K is the rise-span ratio, H is the total height of the structure, and H w Where A is the height of the vertical wall and B is the width of the arch. The standard to be complied with is the "Code for Design of Underground Powerhouses of Hydropower Stations" (NB / T 35090-2016).

[0088] If the rise-to-span ratio calculated based on the input basic parameters does not meet the specifications, it is necessary to continuously adjust the input basic parameter values of the model until the requirements are met.

[0089] At this point, the construction of the model is basically completed. You can set the "Family Category" of the round arch straight wall family to "General Model", its material type to cast-in-place concrete, and its naming standard to round arch straight wall type top arch_H w / B_Spray mix thickness δ.

[0090] In actual engineering design applications, it is also necessary to establish the relationship between the model excavation volume, support volume and top arch component parameters, and output this part of the engineering volume accurately and efficiently.

[0091] Step S120 defines the model output, including: support surface area, number of supporting anchors of the circular arch straight wall section, and excavation volume of the circular arch straight wall section.

[0092] Assuming that the entire perimeter of the circular arched wall opening is supported, the anchor rod (anchor cable) support parameters are φ25@a×bm (using anchor rods with a diameter of 25 mm, and spacing and row spacing of a and b respectively). The specific calculation is as follows:

[0093] 1) The algorithm for calculating the support surface area is:

[0094] S ur =(2×H w +S1+2×S2)×L,

[0095] Among them, S ur is the support surface area, S1 is the arc length of the central arch, S2 is the arc length of the left and right arches, and L is the length of the arch straight wall;

[0096] 2) The support amount of the circular arch straight wall section is the number of support anchors. The number of support anchors is related to the support surface area and its calculation method is:

[0097] Right now:

[0098] Where N is the number of anchor rods, a and b are the spacing and row spacing of anchor rods, and H is the spacing of anchor rods. w is the height of the straight wall, S1 is the length of the central arch, S2 is the length of the left and right arches, L is the length of the arch straight wall, S ur is the support surface area;

[0099] The number of anchor rods for support expansion n also includes the number of anchor rods after deducting the support area of the straight wall section. The calculation method is:

[0100] Among them, N1 is the number of support anchors, a and b are the spacing and row spacing of support anchors, S1 is the arc length of the central arch, S2 is the arc length of the left and right arches, and L is the length of the arch straight wall.

[0101] 3) The calculation method of the excavation volume of the circular arch vertical wall is:

[0102] Among them, M is the excavation volume of the arch straight wall section, B is the arch width, and H is the total height of the structure.

[0103] Although the Revit software schedule function cannot directly obtain the support amount and excavation amount of the arch straight wall section, it can be set as a shared parameter through H w The above results are automatically calculated by Revit software, and are finally reflected in the engineering quantity table of arch straight wall components. Figure 4 As shown, the excavation volume, support surface area, and support volume are all calculated by the algorithm provided in this step.

[0104] The present invention provides two methods for creating BIM models of underground powerhouse cavern circular arch straight wall structures, realizing the creation of parameterized-driven models. By modifying basic input parameters, the underground cavern circular arch straight wall model can be accurately and quickly created. On the other hand, through the parameterized BIM model, a calculation relationship between each basic input parameter and the engineering quantity, support quantity and excavation quantity of the shotcrete component of the circular arch straight wall section is established, realizing a seamless connection between the model and the output engineering quantity. The calculation results are highly accurate and can meet the usage requirements in various application scenarios.

[0105] The above disclosures are only a few specific embodiments of the present invention. However, the present invention is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A method for modeling a parametric model of a circular arch straight wall type top arch component, characterized in that: The following steps are involved: Creating a circular arch straight wall type top arch component model includes: defining a family category, material type, and name corresponding to the model, selecting a corresponding REVIT function, and generating a top arch structure corresponding to the model; the top arch structure is a certain thickness of concrete sprayed on the rock surface after the top arch of the underground project is excavated, including two straight walls and three inscribed circular arches, the centers of the left and right circular arches are on the same horizontal straight line, and the center of the middle circular arch is on the perpendicular bisector of the line connecting the centers of the left and right circular arches; selecting the corresponding function of the REVIT software includes a lofting function, the outline corresponding to the lofting function is a rectangle, and the lofting path is the spatial geometric structure corresponding to the top arch structure; defining logical operation parameters of the model, wherein the logical operation parameters are used to implement constraint relationships between geometric figures constituting the model, wherein the geometric figures are controlled by graphic input parameters; Defining the model output of the model, the model output includes: model volume, top arch segment surface area, related support amount, excavation amount; The logical operation parameters include: the difference in radius between the large and small arches, the rise of the central large arch, the total height of the structure, the horizontal length of the central arch, the arc length of the central arch, and the arc lengths of the left and right arches. The logical operation parameters are calculated based on the graphic input parameters. The calculation method includes: The calculation formula for the difference in radius between the large and small arches is: ,in is the difference in radius between the large and small arches, is the radius of the middle large arch, is the radius of the small arch on the left and right sides; The calculation formula for the central large circular arch sagitta is: ， in, The center arch height, is the difference in radius between the large and small arches, is the radius of the middle large arch, is the radius of the small arch on the left and right sides; The formula for calculating the total height of the structure is: ， in, The total height of the structure, For vertical walls, The center arch height, is the width of the top arch; The calculation formula for the horizontal length of the central arch is: , where D is the length of the central arch, is the radius of the middle large arch, The central arch height; The calculation formula of the arc length of the central arch is: ， in, is the arc length of the central arch, is the radius of the middle large arch, The central arch height; The calculation formula for the arc length of the left and right small arches is: ， in, The length of the left and right arches, is the radius of the middle large arch, is the radius of the small arch on the left and right sides.

2. The modeling method according to claim 1, characterized in that The basic parameters of the profile include: component length, thickness of sprayed concrete; The parameters of the lofting path include: top arch width, straight wall height, middle large arch radius, and left and right small arch radius.

3. The modeling method according to claim 1, characterized in that The calculation method of the logic operation parameters also includes a verification method of the basic parameter numerical input, including: Calculating the rise-to-span ratio of the top arch model and determining whether the rise-to-span ratio complies with the specification; The calculation method of the rise-to-span ratio is: K= , where K is the span ratio, The total height of the structure, For vertical walls, is the arch width.

4. The modeling method according to claim 1, characterized in that The family category corresponding to the model is conventional type, the material type is cast-in-place concrete, and the name is round arch straight wall top arch_ / _Spray mix thickness .

5. The modeling method according to claim 1, characterized in that The parameters of the model output include: the number of support anchors, the excavation volume of the arch straight wall section, and the calculation method includes: The calculation method of the number of support anchor rods is: N , where N is the number of anchor rods, a and b are the spacing and row spacing of anchor rods, For vertical walls, is the arc length of the central arch, The length of the left and right arches, is the length of the straight wall of the arch; The calculation method for the excavation volume of the circular arch straight wall section is: , where M is the excavation volume of the arch straight wall section, is the arch width, The total height of the structure.

6. The modeling method according to claim 5, characterized in that: The number of supporting anchor rods also includes the number of anchor rods after deducting the support area of the straight wall section, and the calculation method is: , where N1 is the number of anchor rods, a and b are the spacing and row spacing of anchor rods, is the arc length of the central arch, The length of the left and right arches, is the length of the straight wall of the arch.

7. The modeling method according to claim 1, characterized in that The functions corresponding to the selected REVIT software include a stretching function, the section corresponding to the stretching function is the geometric structure corresponding to the top arch structure, the stretching direction corresponding to the stretching function is the normal direction of the plane where the section is located; and the stretching length is the length of the component.

8. The modeling method according to claim 7, characterized in that , The basic parameters of the cross section include: thickness of shotcrete, width of arch, height of vertical wall, radius of middle large arch, radius of left and right small arches; The basic parameters of the stretching path include: the length of the circular arch straight wall type component.

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