Graphics Programs Reference
In-Depth Information
8.
Click the center of the circle marked A. Then click the remaining
circles in order from left to right. Press Enter after clicking the circle
marked G.
The newly created profile consists of a PVI at each point you
clicked. Because you used the Draw Tangents With Curves com-
mand, all PVIs (except for the begin and end points) also include a
vertical curve.
9.
Save and close the drawing.
You can view the results of successfully completing this exercise by
opening
Design Profile - Complete.dwg
.
Editing Profiles
As you learned in Chapter 5, “Designing in 2D Using Alignments,” it is common
(and often recommended) to lay out a rough version of a design and then apply
a series of refinements to achieve the final design. This is especially true with
profiles because the first pass is usually an attempt to match existing ground as
closely as possible without creating too many of your own bumps in the road.
Why try to match existing ground? Quite simply, it's cheaper. The closer your
new road matches the existing terrain, the less earth will need to be moved to
construct it. The cost of moving earth is measured by the volume of earth that
is excavated, so less digging equals less cost.
After you create the initial profile that roughly matches existing ground,
you must then refine the design based on various factors such as performance
requirements for the road, avoiding overhead and underground obstacles, and
ensuring that rainwater will drain properly. Many times, the adjustments you
make are based not only on your own ideas but also on the input of others
involved in the project. Whatever the case, a good set of tools for editing pro-
files is going to come in handy. Civil 3D provides a robust set of tools for edit-
ing profiles graphically and numerically.
If you haven't already
done so, download
and install the files for
Chapter 7 according to
the instructions in the
Introduction.
Exercise 7.4: Edit a Profile with Grips
In yet another respect, profiles are similar to alignments in that they come
equipped with specialized grips that enable editing to be done efficiently. In
this exercise, you'll use grips to edit the Jordan Court design profile.
▶
1.
Open the drawing named
Graphical Editing.dwg
located in the
Chapter 07
class data folder.
