Method for drawing pit-in-pit slope edge line by using Revit

Abstract

The application discloses a method for drawing pit-in-pit slope edge line by using Revit, relates to the technical field of building construction, and comprises the following steps: step S1, drawing a foundation pit plane layout; step S2, establishing a foundation pit model; and step S3, soil excavation quantity statistics; the step S2 specifically comprises the following steps: step S201, theoretical calculation; step S202, modeling step; and step S203, model processing. The application draws the pit excavation slope edge line by using Revit, which not only effectively makes up for the defects of design construction drawings, but also meets the demand for accurate positioning of the edge line on site, and can quickly calculate the soil excavation quantity, thereby providing reliable data for the construction of the soil engineering on site. The Revit drawing method is simple to operate and easy to be mastered by the on-site managers, can not only directly and visually check the pit slope condition through a three-dimensional view, but also draw any section view, reduces construction errors and rework caused by unclear expression of the construction drawings, and is suitable for complex projects with embedded foundation pits.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically a method for drawing the slope line of a pit within a pit using Revit. Background Technology

[0002] Revit is an architectural design software that supports Building Information Modeling (BIM). It can be used to create 3D models of buildings, as well as related architectural information and documents. In construction and architectural design, a "pit within a pit" typically refers to the appropriate sloping and treatment of an external pit during excavation to form an internal pit or trench. Sloping is a treatment method with a specific angle along the slope surface to prevent soil collapse or water accumulation. The slope line is a geometric line drawn according to the slope requirements; it represents the location of the slope in the 3D model. By using Revit software according to engineering drawings or design requirements, the slope line is drawn, including precise parameters such as the slope angle and width of different parts, to provide detailed guidance for subsequent design and construction. In current structural construction drawings, the raft foundation slope lines are mostly not marked, and some foundation pit cross-sections are only shown as schematic diagrams. This has led to mis-excavation or over-excavation during construction, especially when there are many foundation pits that are nested together. This can easily cause construction errors and frequent rework, affecting the actual construction progress. Summary of the Invention

[0003] This invention provides a method for drawing the slope line of a pit within a pit using Revit, which can effectively solve the problem mentioned in the background art that the slope line of the raft foundation in most current structural construction drawings is not marked, and some foundation pit cross-sections are only represented in the form of schematic diagrams, which causes the situation of mis-excavation or over-excavation during construction. This is especially significant when there are many foundation pits that are nested together, which can easily lead to construction errors and frequent rework, affecting the actual construction progress.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for drawing the slope line of a pit within a pit using Revit software, which can accurately draw the slope line of the foundation pit, effectively make up for the defects of the design and construction drawings, meet the needs of accurate positioning of the edge line on site, and quickly calculate the earthwork excavation volume. Includes the following steps: Step S1: Draw the foundation pit layout plan; Step S2: Establish the foundation pit model; Step S3, earthwork excavation volume statistics; Step S4: Set an adjustable range for the slope edge line; Step S2 specifically includes the following steps: Step S201, theoretical calculation; Step S202, Modeling Step; Step S203, model processing.

[0005] Step S4 specifically includes the following steps: Step S401: Set an adjustable slope angle range for the slope position; Step S402: Set an adjustable depth range for the planar position; Step S403: Set an adjustable slope angle range for the last slope position.

[0006] According to the above technical solution, in step S1, during the specific process of drawing the foundation pit plan layout, the location and accurate dimensions of the sump pit and elevator foundation pit are determined based on the structural foundation plan layout and architectural construction drawings. It is necessary to check the design drawings to ensure that the pit location coordinates and size are consistent with the actual situation. Then, draw the foundation pit layout plan. The plan should include the outline of all foundation pits and indicate the bottom elevation of each pit. This will provide basic foundation data for subsequent BIM modeling, ensuring that the model is consistent with the actual design and avoiding problems such as mis-excavation and over-excavation during construction. It is necessary to ensure the accuracy of the bottom elevation marking, as it directly affects the subsequent depth calculation and slope dimensions of the model.

[0007] According to the above technical solution, in step S2, Revit's "structural template" is used when establishing the foundation pit model to ensure compatibility with the structural design. Through Revit's three-dimensional functions, the slope edge line can be viewed intuitively, and arbitrary cross-sectional views can be generated.

[0008] According to the above technical solution, step S201 involves performing theoretical calculations to determine the slope dimensions before establishing the model, determining the slope angle α based on the structural design and drawing requirements, verifying the value of the slope angle α to ensure that the slope angle α is reasonable in order to avoid dimensional errors, and then determining the slope dimensions at the bottom and top of the foundation pit.

[0009] According to the above technical solution, in step S201, during the specific calculation process, the slope dimension at the bottom of the foundation pit is calculated according to Formula 1, and the slope dimension at the top of the foundation pit is calculated according to Formula 2. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model is established based on the relationship between the net structural dimensions and the thickness of the structural layers. The bottom control boundary line can be calculated using the following formula, Formula 1, as follows: ; in, A The length or width of the bottom edge of the foundation pit. h For raft thickness, a For the thickness of the mattress padding layer, bFor the thickness of the cushion layer, c This refers to the thickness of the waterproof layer. Formula 2 is as follows: ; in, B The length or width of the top edge of the foundation pit. H1 This is the top elevation of the raft foundation. H2 This is the bottom elevation of the foundation pit; The accuracy of slope dimensions can be effectively ensured by using formula calculations to avoid construction errors. The same units must be used in the calculations. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model for the bottom control boundary line is established based on the net dimensions of the structure and the thickness relationships of the raft foundation, mattress layer, cushion layer, and waterproof layer. The dimensions of the bottom control boundary line can be calculated using the following formula: in: For the first The pit is in the first The top control edge size after the next iteration; For the first The bottom edge dimensions of each pit are controlled; For the first Initial slope coefficient for each pit; For the first The depth of the pit; For the first With the Planar feature distance between pits; The weighting of the pit area; This is the distance attenuation coefficient; This is the depth difference response function; For the first Boundary correction amount in the next iteration; To correct the gain coefficient; When multiple pit-within-a-pit are arranged adjacently, the slope boundaries between adjacent pits may affect each other. To address this, a coupling calculation model between pits is established to correct the control boundary line at the top of the pits. The calculation relationship is as follows: in: For the first The slope surface is in a horizontal position Vertical elevation difference at the location; This represents the total elevation difference of the slope at this level. This is the horizontal unfolded length of the slope surface at this level; These are parameters for controlling slope morphology. when At that time, it was a normal straight slope; when At times, it can manifest as "gentle at the top and steep at the bottom"; when At times, it can manifest as "steep at the top and gentle at the bottom"; Further control over slope curvature changes; When a pit-within-a-pit has a multi-level excavation structure, there is a recursive relationship between the slope edges of each level. Therefore, a layered recursive calculation model is established, and its recursive relationship is as follows: in: For the first The boundary legality index of each pit; Indicates the first Pit and the first Does the slope of the pit have a tendency to intersect? The volume of the intersecting overlap; For reference volume; These are the weighting coefficients; To avoid tiny constants with a denominator of zero; The criterion can be written as: .

[0010] According to the above technical solution, in step S202, the modeling process is completed in Revit, using structural templates to create a new project. The specific modeling steps include the following: Step A: Define the elevation; Step B: Import the foundation pit layout plan; Step C, draw the soil layers; Step D: Draw the edge line of the foundation pit; Step E: Complete the model.

[0011] According to the above technical solution, in step A, a new project is created using the "structural template" in the Revit software template file, the "elevation" is defined and named according to the actual situation. It is necessary to ensure that the naming is clear and easy to refer to later, so as to match the actual project requirements and provide a benchmark for subsequent plan views. Step B, importing the foundation pit plan layout base map, involves importing the already drawn foundation pit plan layout base map into the structural plane "Completed Excavation Surface of On-site Earthwork", and using the "Built-in Model" to simulate and establish the completed excavation surface of on-site earthwork, where the "Family Category" is selected as "Regular Model" to ensure that the base map is aligned with the project coordinates as a modeling reference; In step C, drawing the soil layers involves using the "Extrude" command in the "Create" menu after entering the "Built-in Model" interface to draw the soil layers within the main building raft slab area. It is important to note that the thickness of the drawn soil layer must be greater than the depth of the foundation pit to ensure that the model covers all excavation areas. Duplicate the existing soil layer model and name them "Post-Excavation Model" and "Pre-Excavation Model" respectively for subsequent processing.

[0012] According to the above technical solution, step D, drawing the edge lines of the foundation pit, involves selecting the model after the foundation pit is excavated and entering the model editing interface. The "Hollow Fusion" command in the "Hollow Shape" drop-down menu of the "Create" menu is used to draw the edge lines of the bottom and top of the foundation pit respectively according to formula 1 and formula 2. Specifically, the dimensions of the bottom edge of the excavation pit are calculated based on Formula 1, and the dimensions of the top edge of the excavation pit are calculated based on Formula 2. It is important to adjust the values ​​in the attributes to ensure the correct depth of the excavation pit. H1 , H2 The accuracy; Step E, completing the model, involves the automatic merging of the foundation pit edges after each foundation pit is drawn to form the slope edge. At the same time, the 3D model can be viewed, and the 3D view can be used to visually check the model to ensure that the slope effect meets the design. Thus, the foundation pit modeling is completed.

[0013] According to the above technical solution, step S203 refers to the need for post-processing after the model is established to generate construction drawings. During model processing, the section drawing can be drawn by using the "Section" command in the "View" menu. According to the actual needs of the project, the section can be set at any position on the plane to generate the section drawing to meet the specific needs in construction. Finally, annotate the completed plan and section drawings, using the "Align" command in the "Annotations" menu to annotate the dimensions and elevations of the plan and section drawings. After completion, export the CAD 2D drawings for direct use in on-site construction guidance.

[0014] According to the above technical solution, step S3 specifically involves using Revit's statistical function to quickly calculate the earthwork volume, using the statistical earthwork excavation volume to support construction decisions and provide data support for construction. The "Schedule" command in the "View" menu is used to create a new schedule, select "Regular Model" in the category, and name it "Main Building Foundation Pit Excavation Calculation". Add three fields, "Family", "Volume", and "Tag", to the details table properties. The names in the generated details table can be renamed according to the actual situation. Specifically, the model name can be changed to the specific pit identifier. The earthwork excavation volume can be directly calculated through the volume statistics of the details table to provide reliable data support and reduce waste in earthwork projects.

[0015] Based on the above technical solution, in steps S401 and S402, the slope angle range and depth range are set sequentially from high to low according to the number of pit layers.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention starts with the foundation pit plan layout, and through theoretical calculations and Revit modeling, accurately draws the slope boundary lines and calculates the earthwork volume, making up for the deficiencies in the design drawings. It achieves 3D visualization and rapid section generation. Furthermore, using Revit to draw the foundation pit excavation slope boundary lines not only effectively compensates for the deficiencies in the design and construction drawings, but also meets the need for precise on-site positioning of the boundary lines. At the same time, it can quickly calculate the earthwork excavation volume, providing reliable data for on-site earthwork construction. The method of drawing the foundation pit slope boundary lines in Revit is simple to operate and easy for on-site managers to master. It can not only intuitively view the foundation pit slope situation through a 3D view, but also draw arbitrary section diagrams, reducing construction errors and rework caused by unclear expressions in the construction drawings. It is suitable for complex projects with nested foundation pits. It can also effectively solve the problem of unclear marking of raft foundation slope lines in construction drawings. It enables accurate drawing of foundation pit slope lines through Revit software, avoiding incorrect or over-excavation during construction. It supports the drawing of 3D views and arbitrary cross-sectional views, improving the accuracy and efficiency of later construction.

[0017] By setting adjustable slope angle and depth ranges for the pit-in-pit slope line drawing in Revit, space is reserved for subsequent adjustments. After surveying the earthwork and surrounding environment, it is determined whether adjustments are needed based on the survey data. Adjustments can then be made directly within the adjustable range in Revit, which better meets the actual construction stability, earthwork volume, and standard requirements. Moreover, by setting an adjustable range, subsequent adjustments have a certain reference basis, making adjustments more convenient and making the pit-in-pit slope line drawing in Revit more flexible and in line with actual construction conditions. Furthermore, based on traditional foundation pit slope calculation, this invention establishes a coupled calculation relationship between pits within pits and combines it with a hierarchical recursive calculation model to uniformly calculate and control the slope boundary lines of multi-level pits within pits. This effectively solves the problem of mutual influence between slope boundaries of adjacent pits within pits and improves the rationality and consistency of slope boundary line calculation results.

[0018] Meanwhile, by introducing a parametric slope description method, the spatial morphology of the slope can be flexibly adjusted according to different foundation pit depths and slope conditions, thereby improving the accuracy and adaptability of the model representation. Based on this, combined with an iterative correction mechanism to dynamically update the slope boundary lines, adaptive adjustment of slope parameters can be achieved while meeting construction safety requirements, thus avoiding boundary line conflicts or over-slope problems caused by fixed slope parameters.

[0019] Therefore, this invention can not only improve the automation level of drawing the slope line of the pit-in-pit, but also improve the rationality of the slope design while ensuring construction safety, and further enhance the application efficiency and accuracy of the Revit model in complex foundation pit engineering, thus having good engineering practical value. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0021] In the attached diagram: Figure 1 This is a flowchart of the steps of the slope edge line drawing method of the present invention; Figure 2 This is a schematic diagram of the foundation pit layout of the present invention; Figure 3 This is a schematic diagram illustrating the definitions of various elevations in this invention; Figure 4 This is a schematic diagram of the interface for selecting the family category of this invention; Figure 5 This is a schematic diagram of the built-in model menu of this invention; Figure 6 This is a schematic diagram of the interface for editing the depth of the foundation pit in this invention. Figure 7 This is a schematic diagram of the two-dimensional foundation pit model of the present invention; Figure 8 This is a schematic diagram of the three-dimensional foundation pit model of the present invention; Figure 9 This is a schematic diagram of the cross-sectional view of the foundation pit of the present invention; Figure 10 This is a schematic diagram showing the detailed statistics of earthwork volume in this invention; Figure 11 This invention is based on Figure 9 The cross-sectional view shows the setting of the slope angle and depth range; Figure 12 This is a flowchart of the slope angle range and depth range settings in Embodiment 2 of the present invention. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example: Figure 1 As shown, the present invention provides a technical solution that uses Revit to draw the slope line of the pit within the pit. The Revit software is used to accurately draw the slope line of the foundation pit, which effectively makes up for the defects of the design and construction drawings, meets the needs of accurate positioning of the edge line on site, and quickly calculates the earthwork excavation volume. Includes the following steps: Step S1: Draw the foundation pit layout plan; Step S2: Establish the foundation pit model; Step S3, earthwork excavation volume statistics; Step S4: Set an adjustable range for the slope edge line; Step S2 specifically includes the following steps: Step S201, theoretical calculation; Step S202, Modeling Step; Step S203, Model processing; Step S4 specifically includes the following steps: Step S401: Set an adjustable slope angle range for the slope position; Step S402: Set an adjustable depth range for the planar position; Step S403: Set an adjustable slope angle range for the last slope position.

[0024] Based on the above technical solution, in step S1, during the specific process of drawing the foundation pit plan layout, the location and accurate dimensions of the sump pit and elevator pit are determined according to the structural foundation plan layout and architectural construction drawings. It is necessary to check the design drawings to ensure that the pit location coordinates and size are consistent with the actual situation. Then, draw a base plan of the foundation pit layout. This base plan needs to include the outlines of all foundation pits and indicate the bottom elevation of each pit. This provides foundational data for subsequent BIM modeling, ensuring the model matches the actual design and preventing mis-excavation and over-excavation during construction. The foundation pit layout is as follows: Figure 2 As shown; It is necessary to ensure the accuracy of the bottom elevation marking, as it directly affects the subsequent depth calculation and slope dimensions of the model.

[0025] Based on the above technical solution, in step S2, Revit's "structural template" is used when building the foundation pit model to ensure compatibility with the structural design. Through Revit's three-dimensional functions, the slope edge line can be viewed intuitively, and arbitrary cross-sectional views can be generated.

[0026] Based on the above technical solution, step S201 involves performing theoretical calculations to determine the slope dimensions before establishing the model. According to the structural design and drawing set 16G101-3 requirements, the slope angle α is determined. It is necessary to verify the value of the slope angle α to ensure that the slope angle α is reasonable in order to avoid dimensional errors. Then, the slope dimensions at the bottom and top of the foundation pit are determined.

[0027] Based on the above technical solution, in step S201, during the specific calculation process, the slope dimension at the bottom of the foundation pit is calculated according to Formula 1, and the slope dimension at the top of the foundation pit is calculated according to Formula 2. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model is established based on the relationship between the net structural dimensions and the thickness of the structural layers. The bottom control boundary line can be calculated using the following formula, Formula 1, as follows: ; in, A The length or width of the bottom edge of the foundation pit. h For raft thickness, a For the thickness of the mattress padding layer, b For the thickness of the cushion layer, c This refers to the thickness of the waterproof layer. Formula 2 is as follows: ; in, B The length or width of the top edge of the foundation pit. H1 This is the top elevation of the raft foundation. H2 This is the bottom elevation of the foundation pit; The accuracy of slope dimensions can be effectively ensured by using formula calculations to avoid construction errors. The same units must be used in the calculations. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model for the bottom control boundary line is established based on the net dimensions of the structure and the thickness relationships of the raft foundation, mattress layer, cushion layer, and waterproof layer. The dimensions of the bottom control boundary line can be calculated using the following formula: in: For the first The pit is in the first The top control edge size after the next iteration; For the first The bottom edge dimensions of each pit are controlled; For the first Initial slope coefficient for each pit; For the first The depth of the pit; For the first With the Planar feature distance between pits; The weighting of the pit area; This is the distance attenuation coefficient; This is the depth difference response function; For the first Boundary correction amount in the next iteration; To correct the gain coefficient; After determining the bottom control line of the foundation pit, calculate the top control line of the foundation pit based on the slope height and slope coefficient. The dimensions of the top control line can be calculated using the following formula: Depth difference response function in: For the first Dimensions of the control boundary line corresponding to the slope surface; This represents the basic slope development amount for this layer; To construct the external expansion compensation amount; This is the coupling compensation amount for adjacent pit boundaries; This is the interlayer gradient continuation term; When multiple pit-within-a-pit are arranged adjacently, the slope boundaries between adjacent pits may affect each other. To address this, a coupling calculation model between pits is established to correct the control boundary line at the top of the pits. The calculation relationship is as follows: in: For the first The slope surface is in a horizontal position Vertical elevation difference at the location; This represents the total elevation difference of the slope at this level. This is the horizontal unfolded length of the slope surface at this level; These are the parameters for controlling slope morphology.

[0028] when At that time, it was a normal straight slope; when At times, it can manifest as "gentle at the top and steep at the bottom"; when At times, it can manifest as "steep at the top and gentle at the bottom"; Further control over slope curvature changes; When a pit-within-a-pit has a multi-level excavation structure, there is a recursive relationship between the slope edges of each level. Therefore, a layered recursive calculation model is established, and its recursive relationship is as follows: in: For the first The boundary legality index of each pit; Indicates the first Pit and the first Does the slope of the pit have a tendency to intersect? The volume of the intersecting overlap; For reference volume; These are the weighting coefficients; To avoid tiny constants with a denominator of zero.

[0029] The criterion can be written as: To further describe the spatial morphology of the slope surface, a parametric slope function model is introduced, whose slope height distribution can be expressed by the following formula: If the conditions are not met, then execute the next round of boundary correction. in: For the first The amount of correction; For the first The earthwork volume corresponding to each pit; The construction constraint cost function; To adjust the step size.

[0030] Termination conditions: .

[0031] Based on the above technical solution, in step S202, the modeling process is completed in Revit, using structural templates to create a new project. The specific modeling steps include the following: Step A: Define the elevation; Step B: Import the foundation pit layout plan; Step C, draw the soil layers; Step D: Draw the edge line of the foundation pit; Step E: Complete the model.

[0032] Based on the above technical solution, in step A, a new project is created using the "Structural Template" in the Revit software template file. "Elevations" are defined and named according to the actual situation, ensuring the names are clear and easy to reference later to match the actual project requirements and provide a benchmark for subsequent plan views. The elevation definitions are as follows: Figure 3 As shown; Step B, importing the foundation pit layout base map, involves importing the pre-drawn foundation pit layout base map into the structural plane "Completed Excavation Surface," and using the "Built-in Model" to simulate and create the completed excavation surface. The "Family Category" is set to "Regular Model," ensuring the base map is aligned with the project coordinates for modeling reference. The family category selection is as follows: Figure 4 As shown; Step C, drawing the soil layers, involves entering the "Built-in Model" interface and using the "Extrude" command in the "Create" menu to draw the soil layers within the main building raft foundation area. The Built-in Model menu is as follows: Figure 5 As shown, it is important to note that the thickness of the earthwork drawn must be greater than the depth of the foundation pit to ensure that the model covers all excavation areas. Duplicate the existing soil layer model and name them "Post-Excavation Model" and "Pre-Excavation Model" respectively for subsequent processing.

[0033] Based on the above technical solution, in step D, drawing the edge lines of the foundation pit involves selecting the model after the foundation pit is excavated and entering the model editing interface. The "Hollow Fusion" command in the "Hollow Shape" drop-down menu of the "Create" menu is used to draw the edge lines of the bottom and top of the foundation pit according to formulas 1 and 2 respectively. Specifically, the dimensions of the bottom edge of the excavation pit are calculated based on Formula 1, and the dimensions of the top edge of the excavation pit are calculated based on Formula 2. It is important to adjust the values ​​in the attributes to ensure the correct depth of the excavation pit. H1 , H2 The accuracy of editing the depth of the foundation pit, such as Figure 6 As shown; Step E, completing the model, involves the automatic merging of the foundation pit edges after each foundation pit is drawn to form the slope edge. At the same time, the 3D model can be viewed, and the 3D view can be used to visually check the model and ensure that the slope effect meets the design. The foundation pit modeling is then complete.

[0034] Based on the above technical solution, step S203 refers to the post-processing required after the model is established to generate construction drawings. During model processing, a section view is drawn using the "Section" command in the "View" menu. Sections can be set at any location on the plane according to the actual needs of the project to generate section views, thus meeting the specific needs of construction. The foundation pit section icon is labeled as follows. Figure 9 As shown; Finally, the completed plan and section views are annotated. The "Align" command in the "Annotations" menu is used to annotate the dimensions and elevations of the plan and section views. The two-dimensional and three-dimensional foundation pit models are shown below. Figure 7-8 As shown, after completion, export the CAD 2D drawings for direct use in on-site construction guidance.

[0035] Based on the above technical solution, step S3 specifically involves using Revit's statistical functions to quickly calculate the earthwork volume, using the statistical earthwork excavation volume to support construction decisions and provide data support for construction. The "Schedule" command in the "View" menu is used to create a new schedule, select "General Model" in the category, and name it "Main Building Foundation Pit Excavation Calculation". Add three fields: "Family," "Volume," and "Label" to the schedule properties. The names in the generated schedule can be renamed according to the actual situation. Specifically, this includes changing the model name to the specific pit identifier. By creating a pre-excavation model and a post-excavation model, and using the Revit schedule to calculate the volume difference between the two, the excavation volume of the pit can be obtained. The detailed earthwork volume statistics are as follows: Figure 10 As shown, this provides reliable data support and reduces waste in earthwork projects.

[0036] Example 2: like Figure 11 and Figure 12 As shown, first, the Revit drawing is as follows: Figure 9 In the cross-sectional view of the foundation pit shown, the ground surface is marked as the first plane, and the slope angle between the ground surface and the first slope surface is marked as A1. The adjustable range of slope angle A1 is [A1-a1, A1+a1]. The height of the first slope is the depth excavated from the ground, denoted as H1. The adjustable range of depth H1 is [H1-h1, H1+h1]. The slope angle of the second slope position is marked from high to low and denoted as B1. The adjustable range of slope angle B1 is [B1-b1, B1+b1]. The height of the second slope is the depth excavated downwards from the second plane, denoted as H2. The adjustable range of depth H2 is [H2-h2, H2+h2]. The third plane is the last plane. The slope angle is marked by the position of the last plane and denoted as C1. The adjustable range of slope angle C1 is [C1-c1, C1+c1]. After surveying the earthwork and surrounding environment, determine whether adjustments are needed based on the survey data. In Revit, adjust the drawn pit-in-pit slope line according to the adjustable range mentioned above. This will better meet the actual construction stability, earthwork volume, and standard requirements. Moreover, by setting the adjustable range, subsequent adjustments have a certain reference basis, making adjustments more convenient and making the drawing of pit-in-pit slope line in Revit more flexible and in line with the actual construction situation.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for drawing the slope line of a pit within a pit using Revit, characterized by: Revit software can be used to accurately draw the slope line of the foundation pit, effectively making up for the deficiencies of the design and construction drawings, meeting the needs of accurate positioning of the edge line on site, and quickly calculating the earthwork excavation volume. Includes the following steps: Step S1: Draw the foundation pit layout plan; Step S2: Establish the foundation pit model; Step S3, earthwork excavation volume statistics; Step S4: Set an adjustable range for the slope edge line; Step S2 specifically includes the following steps: Step S201, theoretical calculation; Step S202, Modeling Step; Step S203, Model processing; Step S4 specifically includes the following steps: Step S401: Set an adjustable slope angle range for the slope position; Step S402: Set an adjustable depth range for the planar position; Step S403: Set an adjustable slope angle range for the last slope position.

2. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: In step S1, during the specific process of drawing the foundation pit plan layout, the location and accurate dimensions of the sump pit and elevator pit are determined based on the structural foundation plan layout and architectural construction drawings. It is necessary to check the design drawings to ensure that the pit location coordinates and size are consistent with the actual situation. Then, draw the foundation pit layout plan. The plan should include the outline of all foundation pits and indicate the bottom elevation of each pit. This will provide basic foundation data for subsequent BIM modeling, ensuring that the model is consistent with the actual design and avoiding problems such as mis-excavation and over-excavation during construction. It is necessary to ensure the accuracy of the bottom elevation marking, as it directly affects the subsequent depth calculation and slope dimensions of the model.

3. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: In step S2, Revit's "structural template" is used when building the foundation pit model to ensure compatibility with the structural design. Through Revit's three-dimensional functions, the slope line can be viewed intuitively, and arbitrary cross-sectional views can be generated.

4. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: Step S201 involves performing theoretical calculations to determine the slope dimensions before establishing the model. Based on the structural design and drawing requirements, the slope angle α is determined. The value of the slope angle α needs to be verified to ensure that the slope angle α is reasonable in order to avoid dimensional errors. Then, the slope dimensions at the bottom and top of the foundation pit are determined.

5. The method for drawing the slope line of a pit within a pit using Revit according to claim 4, characterized in that: In step S201, during the specific calculation process, the slope dimension at the bottom of the foundation pit is calculated according to Formula 1, and the slope dimension at the top of the foundation pit is calculated according to Formula 2. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model is established based on the relationship between the net structural dimensions and the thickness of the structural layers. The bottom control boundary line can be calculated using the following formula, Formula 1, as follows: ； in, A The length or width of the bottom edge of the foundation pit. h For raft thickness, a For the thickness of the mattress padding layer, b For the thickness of the cushion layer, c This refers to the thickness of the waterproof layer. Formula 2 is as follows: ； in, B The length or width of the top edge of the foundation pit. H1 This is the top elevation of the raft foundation. H2 This is the bottom elevation of the foundation pit; The accuracy of slope dimensions can be effectively ensured by using formula calculations to avoid construction errors. The same units must be used in the calculations. To determine the dimensions of the bottom control boundary line of the foundation pit, a calculation model for the bottom control boundary line is established based on the net dimensions of the structure and the thickness relationships of the raft foundation, mattress layer, cushion layer, and waterproof layer. The dimensions of the bottom control boundary line can be calculated using the following formula: in: For the first The pit is in the first The top control edge size after the next iteration; For the first The bottom edge dimensions of each pit are controlled; For the first Initial slope coefficient for each pit; For the first The depth of the pit; For the first With the Planar feature distance between pits; The weighting of the pit area; This is the distance attenuation coefficient; This is the depth difference response function; For the first Boundary correction amount in the next iteration; To correct the gain coefficient; When multiple pit-within-a-pit are arranged adjacently, the slope boundaries between adjacent pits may affect each other. To address this, a coupling calculation model between pits is established to correct the control boundary line at the top of the pits. The calculation relationship is as follows: in: For the first The slope surface is in a horizontal position Vertical elevation difference at the location; This represents the total elevation difference of the slope at this level. This is the horizontal unfolded length of the slope surface at this level; These are parameters for controlling slope morphology. when At that time, it was a normal straight slope; when At times, it can manifest as "gentle at the top and steep at the bottom"; when At times, it can manifest as "steep at the top and gentle at the bottom"; Further control over slope curvature changes; When a pit-within-a-pit has a multi-level excavation structure, there is a recursive relationship between the slope edges of each level. Therefore, a layered recursive calculation model is established, and its recursive relationship is as follows: in: For the first The boundary legality index of each pit; Indicates the first Pit and the first Does the slope of the pit have a tendency to intersect? The volume of the intersecting overlap; For reference volume; These are the weighting coefficients; To avoid tiny constants with a denominator of zero; The criterion can be written as: .

6. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: In step S202, the modeling process is completed in Revit, using structural templates to create a new project. The specific modeling steps include the following: Step A: Define the elevation; Step B: Import the foundation pit layout plan; Step C, draw the soil layers; Step D: Draw the edge line of the foundation pit; Step E: Complete the model.

7. The method for drawing the slope line of a pit within a pit using Revit according to claim 6, characterized in that: In step A, a new project is created using the "Structural Template" in the Revit software template file. The "Elevation" is defined and named according to the actual situation. It is necessary to ensure that the naming is clear and easy to reference later, so as to match the actual project requirements and provide a benchmark for subsequent plan views. Step B, importing the foundation pit plan layout base map, involves importing the already drawn foundation pit plan layout base map into the structural plane "Completed Excavation Surface of On-site Earthwork", and using the "Built-in Model" to simulate and establish the completed excavation surface of on-site earthwork, where the "Family Category" is selected as "Regular Model" to ensure that the base map is aligned with the project coordinates as a modeling reference; In step C, drawing the soil layers involves using the "Extrude" command in the "Create" menu after entering the "Built-in Model" interface to draw the soil layers within the main building raft slab area. It is important to note that the thickness of the drawn soil layer must be greater than the depth of the foundation pit to ensure that the model covers all excavated areas. Duplicate the existing soil layer model and name them "Post-Excavation Model" and "Pre-Excavation Model" respectively for subsequent processing; In step D, drawing the edge lines of the foundation pit involves selecting the model after the foundation pit is excavated and entering the model editing interface. The "Hollow Fusion" command in the "Hollow Shape" drop-down menu of the "Create" menu is used to draw the edge lines of the bottom and top of the foundation pit according to Formula 1 and Formula 2 respectively. Specifically, the dimensions of the bottom edge of the excavation pit are calculated based on Formula 1, and the dimensions of the top edge of the excavation pit are calculated based on Formula 2. It is important to adjust the values ​​in the attributes to ensure the correct depth of the excavation pit. H1 , H2 The accuracy; Step E, completing the model, involves the automatic merging of the foundation pit edges after each foundation pit is drawn to form the slope edge. At the same time, the 3D model can be viewed, and the 3D view can be used to visually check the model to ensure that the slope effect meets the design. Thus, the foundation pit modeling is completed.

8. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: Step S203 refers to the post-processing required after the model is established to generate construction drawings. During model processing, the "Section" command in the "View" menu is used to draw section views. Section views can be set at any position on the plane according to the actual needs of the project to generate section views to meet the specific needs of construction. Finally, annotate the completed plan and section drawings, using the "Align" command in the "Annotations" menu to annotate the dimensions and elevations of the plan and section drawings. After completion, export the CAD 2D drawings for direct use in on-site construction guidance.

9. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: Step S3 specifically involves using Revit's statistical functions to quickly calculate earthwork volume, using the statistical earthwork excavation volume to support construction decisions and provide data support for construction. A new schedule is created using the "Schedule" command in the "View" menu, selecting "Regular Model" in the category and naming it "Main Building Foundation Pit Excavation Calculation". Add three fields, "Family", "Volume", and "Tag", to the details table properties. The names in the generated details table can be renamed according to the actual situation. Specifically, the model name can be changed to the specific pit identifier. The earthwork excavation volume can be directly calculated through the volume statistics of the details table to provide reliable data support and reduce waste in earthwork projects.

10. The method for drawing the slope line of a pit within a pit using Revit according to claim 1, characterized in that: In steps S401 and S402, the slope angle range and depth range are set sequentially from high to low according to the number of pit layers.

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