Assemblies and CorridorsObjectivesNotesStudent ExercisesAssemblies and CorridorsKey TermsQuestionsAnswersModule SummaryNOTES Module 10 Assemblies and Corridors In this module, you learn how to work with assemblies and corridors in AutoCAD Civil 3D. Corridor models are used to represent road designs in Civil 3D. An assembly represents the typical cross section and is made from subassemblies. Civil 3D comes with a number of subassemblies that represent different components of a cross section. The corridor model forms the spine of the subdivision grading design. After subdivision corridor models are created, they are used to generate the grading elevations for the parcels in the subdivision. Objectives After completing this module, you will be able to: Create a tool palette. Copy subassemblies from the Subassembly Catalog to the tool palette. Modify subassembly parameters on the tool palette. Create an assembly from subassemblies. Create a corridor model for a subdivision road with a cul-de-sac. Create a surface for the corridor top layer. Generate point data for construction staking. Extract grading feature lines from corridors.AutoCAD Civil 3D 2008 Education Curriculum NOTES Notes Data for this module resides in the \AutoCAD Civil 3D 2008 Education Curriculum\Module 10 – Assemblies and Corridors\ folder. Student Exercises The following exercises are provided in step-by-step format. Open the AutoCAD Civil 3D program prior to beginning the lesson by double-clicking the Civil 3D icon on your desktop. You working in the Imperial system should use the drawing files beginning with an I, while those working in the metric system should use the drawing files beginning with an M. You are provided with a drawing for each exercise in the lesson. The exercises in this module are as follows: 1. Create a Tool Palette for Subassemblies 2. Copy Subassemblies to the Tool Palette 3. Modify Subassembly Parameters 4. Create Assemblies for Cedar Cove Corridor 5. Create a Corridor Model 6. Create a Corridor Surface 7. Generate Point Data for Construction 8. Extract Grading Feature Lines from Corridor 10-2Module 10 – Assemblies and Corridors NOTES Assemblies and Corridors Subdivision design elevations and grades are typically dictated by the design alignments and profiles of the roads. In effect, the roads form the spine of the subdivision horizontal and vertical design. In this module, you create a corridor model for a subdivision road with a cul-de-sac. Corridor models are the end result of an involved design process. Design horizontal and vertical alignments are required, and are provided for the you in this module. Civil 3D corridor models are created by processing a Civil 3D assembly, or typical section, along the design horizontal and vertical alignments. The corridor is calculated at an interval specified by the assembly insertion frequency settings. The assembly, or typical section, is constructed from subassemblies. Subassemblies represent the individual parts of the assembly. A completed assembly is shown in the following illustration: AutoCAD Civil 3D provides several subassemblies that are organized in the Subassembly Catalog. These subassemblies address many possible cross section configurations. Subassemblies exist for lanes, shoulders, curbs and gutters, sidewalks, barriers, structures, pipe trenches, daylighting, and other section components. You can modify the property values for subassemblies to suit the design criteria. For example, you can change the width and pavement structure depths for the lane subassemblies. In this module, you begin by creating a tool palette on the Tool Palette window. The subassemblies required for this module are copied from the Subassembly Catalog to the tool palette. The next step is to modify the properties of the subassemblies on the tool palette. After that, you create an assembly for the subdivision road from the subassemblies on the tool palette. After a subassembly has been created, you can modify the property values of the subassemblies (as part of the assembly) in the drawing. This will result in automatic updates to any corridor models created using those subassemblies and assemblies. 10-3AutoCAD Civil 3D 2008 Education Curriculum NOTES You then create a corridor model from the assembly and the given horizontal and vertical alignments. Next, you create a top surface for the corridor model, generate points for construction staking, and finish with the creation of grading feature lines. The top surface is used to calculate manhole rim elevations and pipe inverts for storm and sanitary sewers in the subdivision. It can also be used to label design spot elevations and design grades. Grading feature lines can be used to design the grading for the parcels adjacent to the corridor models in the subdivision. Key Terms Subassembly A subassembly represents a single component of a road cross section such as a lane, curb structure, or a sidewalk. Subassemblies are assembled to create the assembly. You can choose from over a hundred subassemblies in Civil 3D. Assembly An assembly is created from subassemblies and represents the typical cross section configuration of the proposed road. An assembly for a subdivision road may consist of two lane subassemblies (one for each side), two gutter subassemblies, and two sidewalk subassemblies. Typical Cross Section The typical cross section is the engineering detail that shows the configuration of the proposed cross section for a road. These details include widths, depths, slopes, grades, and materials. Offset locations on a typical cross section are referenced from the road centerline. Civil 3D represents typical cross section with an assembly. Corridor Model A corridor model represents a road design in Civil 3D. Corridor models are created from a design horizontal alignment, proposed vertical alignment, and an assembly. Corridor Surface Corridor surfaces are design surfaces that can be created directly from a corridor model. You can create surfaces for the different depths of a corridor model. Corridor surfaces are displayed in the Surfaces collection. Baseline A baseline is the controlling alignment, profile, and assembly for corridor creation. A corridor can be created using multiple baselines. For example, a corridor model for a road with a cul-de-sac consists of two baselines. One baseline is used to model the main road
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