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.
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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 Table
Module 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 calculate
AutoCAD 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 displayed in the section views and shows the cross
section of a sampled Civil 3D surface. Surface section data is attached to
sample lines when they are created. Surface section data can be used to
calculate earth cut and fill quantities for a road.
Corridor
Section
A corridor section is displayed in the section views and shows the cross section
of a sampled corridor model. Corridor section data is attached to sample lines
when they are created. Corridor section data can be used to calculate corridor
material volumes.
ETW ETW stands for edge of traveled way. This is the Civil 3D code for a point on
the edge of pavement.
Section
Point
A section point is a singular location on a cross section. Examples of section
points include edge of traveled way (ETW) and inside edge of sidewalk
(Sidewalk_In). Section points are used to create the longitudinal corridor
feature lines. Section points can be annotated with offset and elevation labels
in the section view.
Section Link A section link connects section points. Section links can be used to create
corridor surfaces. They can also be annotated with grades in section views.
Section
Shape
A section shape connects the section points. Section shapes can be used to
calculate material volume from corridor cross section data. Section shapes can
also be annotated with end area data.
Code Set
Style
A code set style automatically assigns marker styles to section points, link
styles to section links, and shape styles to section shapes. A code set style can
also automatically assign labels to section points, links, and shapes to corridor
Module 11 – Subdivision Cross Sections and Quantities NOTES
11-7
sections in the section view.
AutoCAD Civil 3D 2009 Education Curriculum NOTES
11-8
EXERCISE 1: CREATE QUANTITY TAKEOFF CRITERIA
Civil 3D calculates quantities using quantity takeoff criteria. Quantity takeoff
criteria associate a user-defined material name with an actual material.
Corridor quantities can be of type cut, fill, cut and refill, earthworks, or
structures.
In this exercise, you create quantity takeoff criteria that is used to calculate the
quantities for the pavement structure for the Cedar Cove corridor. The
completed quantity takeoff criteria appears as shown.
To help you to better understand corridor cross sections, refer to the illustration
as shown.
Points are singular locations on the corridor cross sections and originate from
the subassemblies. You can use points to create offset-elevation labels and to
create Civil 3D points for construction staking.
Links connect the points and are used to create corridor surfaces. You can also
label links with grades and slopes.
Shapes connect the links and are used to calculate corridor section volumes.
You can also label shape end areas.
Module 11 – Subdivision Cross Sections and Quantities NOTES
11-9
Civil 3D assigns default names to points, links, and shapes. For example, in
Civil 3D the edge of pavement is referred to as edge of traveled way, or ETW.
The four layers of a pavement structure are Pave1 (surface course), Pave2
(binder course), Base (upper granular layer), and Subbase (lower granular
layer).
For this exercise, open …\Module 11 – Subdivision Cross Sections and