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UNLV CEE 301 - Subdivision Cross Sections and Quantities

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NOTES Module 11 Subdivision Cross Sections and Quantities Quantity calculation and cross section generation are required elements of subdivision design projects. After the design is completed and approved by the governing agencies, the next step is for the engineer to tender (or bid) the project for construction. The tendering process involves soliciting construction bids from several construction companies. The construction companies, or contractors, submit their bids based on their calculated cost for completing the work. These costs are mostly based on material quantities. Design cross sections display the engineering details of the road that are required for construction. Design cross sections are generated at intervals along the alignment and show the configuration of the proposed road at various locations. In this module, you learn how to generate cross sections and calculate quantities for roads in a subdivision. Objectives After completing this module, you will be able to:  Create quantity takeoff criteria.  Create and edit sample lines.  Create section views showing the road design.  Modify sample line group properties.  Create a code set style and label cross sections.  Calculate subdivision quantities, generate quantity reports, and create a quantity table.AutoCAD Civil 3D 2009 Education Curriculum NOTES 11-2 Notes Data for this module resides in the \AutoCAD Civil 3D 2009 Education Curriculum\Module 11 – Subdivision Cross Sections and Quantities\ 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. Those working in the Imperial system should use the drawing files beginning with the letter I, while those working in the metric system should use the drawing files beginning with the letter M. You are provided with a drawing for each exercise in the lesson. The exercises in this module are as follows: 1. Create Quantity Takeoff Criteria 2. Create and Edit Sample Lines 3. Create Section Views 4. Modify Sample Line Group Properties 5. Create a Code Set Style and Label Cross Sections 6. Calculate Quantities, Generate a Report, and Create a TableModule 11 – Subdivision Cross Sections and Quantities NOTES 11-3 Subdivision Cross Sections and Quantities In this module, you learn how to generate section views and calculate quantities for roads in a subdivision. The first step in the process is to generate cross section sample lines. Sample lines are created perpendicular to an alignment and at specific intervals. These are required for both quantity calculation and the generation of section views. The source data required for creating section views and calculating quantities includes the existing ground surface, corridor cross section, and corridor surface cross section. The corridor cross section is the sampled cross section of the corridor model at each sample line location. The existing ground and corridor surface cross section are the sampled surfaces at each sample line location. Corridor cross sections and existing ground cross sections are displayed in section views. Subdivision road volume calculations typically account for only the pavement structure materials. These include asphalt (surface course and binder course) and granular (base and subbase) materials. To calculate pavement structure volumes, corridor cross section data is attached to the cross section sample lines when the sample lines are created. Earthworks quantities are typically not calculated as part of subdivision road quantities. These are most often determined as part of an overall site grading quantity. You begin this module by creating quantity takeoff criteria to calculateAutoCAD Civil 3D 2009 Education Curriculum NOTES 11-4 pavement structure quantities. The quantity takeoff criteria is general criteria and is stored in a drawing template (DWT). It specifies the types of quantities to be calculated and how the quantities will be calculated. When the corridor model is created, the material names in the corridor do not always match the materials names in quantity takeoff criteria. To calculate the quantities, you assign the corridor material names to the material names in the quantity takeoff criteria. You then create and edit the width of the cross section sample lines. These are organized into a sample line group. The sample line group is a collection of sample lines for an alignment. Once the sample lines have been edited, the next step is to create the section views in the drawing. The section views are the grids that contain the corridor cross section data and the existing ground cross section data.Module 11 – Subdivision Cross Sections and Quantities NOTES 11-5 You then learn how to modify the properties of the sample line group. This is useful when a new surface is generated that is required for either display in the section views for quantity calculation. The next step is to label the corridor cross section data. You apply offset and elevation labels to the pavement edges and slope labels to the pavement surfaces. This module finishes with a quantity calculation, the generation of a quantity report, and the creation of volume tables in the drawing.AutoCAD Civil 3D 2009 Education Curriculum NOTES 11-6 Key Terms Quantity Takeoff Criteria Quantity takeoff criteria specifies which quantities are calculated, the types of quantities, and how the quantities are calculated. Quantity takeoff criteria is applied to a sample line group to create a material list. Material List The material list is created when quantity takeoff criteria is applied to a sample line group. You use the material list to generate quantity takeoff reports and tables. Sample lines Sample lines are created for a horizontal alignment and are required for the creation of section views and for calculating quantities. Sample lines are created in plan view at a specific interval and are usually perpendicular to the alignment. You attach source data to sample lines when they are created. Section View The section view is a gridded plot that shows cross section data. Section data can consist of surface data, corridor data, or even pipe network data. Group Plot Style The group plot style determines the orientation and position of the section views in the drawing. Surface Section A surface section object is


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UNLV CEE 301 - Subdivision Cross Sections and Quantities

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