Unit 3 – Lesson 5: Assemblies and Corridors Civil 3D 2010 Student Workbook ▪ 1 Assemblies and Corridors Overview In this lesson, you learn how to create assemblies and use them to create corridor models. Once a corridor model is created, you learn how to create corridor surfaces from the model. Subassemblies are individual objects that are pieced together as a design cross section, or an assembly object. The assembly object, along with the horizontal and vertical alignment, is used to build the corridor model for a road, highway, railway, embankment, channel, or any cross section-based features. The subassemblies are logically designed, and respond dynamically in the design environment, making it easy to generate and evaluate design alternatives. Sidewalk Curb Lane Assembly Subassemblies Lesson 5 AutoCAD Civil 3D 2010 Education Curriculum Student Workbook Unit 3: Land DevelopmentUnit 3 – Lesson 5: Assemblies and Corridors Civil 3D 2010 Student Workbook ▪ 2 You can use corridor models to represent any road, rail, channel, or berm design that has typical cross-section features. When you create a corridor model, you create a single object that includes all the design components and input parameters for a road or other type of feature created from a typical cross section. A completed corridor model for a residential subdivision road with a cul-de-sac is shown in the following illustration. Corridor surfaces are useful for design and construction tasks. You can use corridor surfaces to calculate earth cut and fill quantities, label spot elevations and slopes, and generate construction staking data.Unit 3 – Lesson 5: Assemblies and Corridors Civil 3D 2010 Student Workbook ▪ 3 Objectives After completing this lesson, you will be able to: - Describe assemblies and subassemblies. - Describe the subassembly input and target parameters. - Create assemblies. - Describe a corridor model and list its components. - Create a corridor model for a subdivision road with a cul-de-sac. - Create a corridor surface. Exercises The following exercises are provided in a step by step format in this lesson: 1. Create Assemblies 2. Create a Corridor Model 3. Create a Corridor Surface About Assemblies and Subassemblies An assembly is an arrangement of cross-section features found on a roadway or other corridor. It represents a typical section of the corridor that you position with an alignment and a profile. You create an assembly using subassembly objects for cross-section elements such as lanes, curbs, sidewalks, shoulders, and side slopes. A subassembly is the basic building block that makes up an assembly. A subassembly is attached to one or both sides of the assembly's baseline, and subsequent subassemblies are attached to the appropriate points of the previously attached subassemblies. An assembly can be defined by attaching all of the subassemblies to one side of a baseline, and then mirroring these subassemblies to the other side of the baseline. Subassemblies are intelligent objects that dynamically react to changes in the design environment. Each subassembly has its own set of parameters that you can modify to change its appearance or behavior. Civil 3D provides a library of the most common, generic subassemblies that you may encounter in roadway design. Along with using the predefined subassemblies in Civil 3D, you can also draw your own subassemblies. Civil 3D has the tools to convert your polyline shape into a subassembly. ThisUnit 3 – Lesson 5: Assemblies and Corridors Civil 3D 2010 Student Workbook ▪ 4 subassembly has limited logic but can be used like any other subassembly when building an assembly. You can build your own custom subassembly with all of the parameters and functionality (or more) of those supplied in the subassembly catalog. When you create an assembly, you can make it available for future projects and other users by saving it on a tool palette, or within the drawing template (DWT) file. You can also save collections of assemblies in an assembly set. An assembly is made up of the following elements. Element Description Baseline The vertical line used as a display reference line for the assembly. Baseline point The point to which you attach subassemblies, and the point on the assembly attached to the horizontal and vertical alignment to create the corridor model. Also known as horizontal and vertical control. Subassemblies Cross-section element objects such as lanes, curbs, shoulders, and side slopes that you add to the assembly object. The subassemblies are added from the tool palette and attached to the assembly baseline or other subassemblies in the assembly. The following illustration shows a simple assembly. On either side of the baseline are subassembly objects that represent a lane, shoulder, guardrail, and cut or fill slope. In this example, the subassemblies are arranged starting from the baseline point, which is indicated by the circle with a square inside it at the midpoint of the baseline. Subassembly Parameters Subassemblies have input and target parameters that are used to change their geometric configuration. Subassembly input parameters control the size, shape, and geometry of theUnit 3 – Lesson 5: Assemblies and Corridors Civil 3D 2010 Student Workbook ▪ 5 subassembly. Custom subassembly input parameters can be saved on a tool palette and also specified when you add the subassembly to an assembly. For example, the most common subassembly for modeling a lane is the LaneOutsideSuper subassembly. The LaneOutsideSuper subassembly has input parameters that set the general configuration values for the lane such as width, pavement depth, and cross fall. The default input parameters for the LaneOutsideSuper subassembly are shown in the following illustration. Some subassemblies have required or optional target parameters. Target parameters control how the subassembly functions. Function is determined by the object the subassembly connects to (alignment, profile, or surface). The daylighting subassemblies have required surface target parameters. You are required to specify a target surface to which the subassembly daylights. The lane subassemblies have optional width and elevation target parameters that can be alignments and profiles. You can optionally override the lane width input parameter by targeting an alignment. This is how you vary the width of the lane in a lane
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