-
From the
Railway section of the
action bar,
click
Horizontal Alignment
.
For more information about the alignment options, see Creating an Horizontal Alignment.
You switch into the Alignment Sketcher
app. The Horizontal alignment initialization dialog box
opens:
-
Choose a profile (railway machines):
Streetcar,
Inter-city or
High speed, because some parameters
(design/maximum speed and curve gradient) may be different depending on the
model selected.
Profiles are based on the existing xml file of Data Setup called RailwayAlignmentDesign. The
corresponding parameters and rules are displayed in the lower part of the
window. They correspond to the selected profiles, managed in Data Setup. You
cannot edit them.
Profiles are managed in Data Setup. It is compulsory to select a
profile to validate the surface creation. Without selection, the
OK button is disabled.
The selected label (context) appears highlighted as blue.
-
Click
OK.
A panel is docked and contains three tabs: the
Alignment assistant, the
Stationings and the
Specifications of the railway project. The panel can
also be floated to one of the four sides of the 3D area, or snapped to other panels. The Specifications tab
contains the parameters and rules corresponding to the selected profile. These
editable values correspond to the values set on the alignment start point.
-
Choose key parameters and rules that should apply to the future
railway alignment.
Values are editable and correspond to the values set on the alignment start
point. Only specifications that can be overloaded are displayed.
Default design rules (Railway Radius Rule,
Railway Length Rule, Railway Gradient
Rule and Railway Superelevation Rule)
are provided by default but you can choose others in an XML document (in
Design Rules from Data Setup).
-
To create your profile with points, lines and arcs, click
Alignment Profile
.
Design checks are run when designing horizontal and vertical alignments. They
are based on design rules. In the Alignment
assistant, check if the radius is compliant with the rules of
the selected machine. For more information, see Creating a Horizontal Alignment.
Road and railway alignments are stored in the same Alignment
set. Road and railway surfaces are stored in nodes, at the
level of the Alignment set.
-
To change the superelevation value, double-click an horizontal
alignment in the
tree.
You switch into the Alignment Sketcher
app. The Alignment assistant panel appears.
-
Double-click a key point.
The Alignment point dialog box is
displayed. It is split into two sections:
- Parameters: used to create the horizontal
alignment. See Creating an Horizontal Alignment.
- Design Rules: predefined status have already been
defined (for radius, length, gradient and superelevation) in design
rules which are a series of recommended parameters to check the
correctness of transition formulas.
-
To edit the superelevation rate, do either of the following:
- Under the
Parameters section, use the combo box of
Superelevation to edit the rate of the
maximum slope in the following road turns (5% for example). The slope angle on
the selected alignment point is not modified, next alignment points inherit
from the current rate and the
Superelevation field is renamed into
Current superelevation containing the
inherited rate.
To modify the superelevation value again, click
Edit
next to
Current Superelevation.
- Under the Design Rules section, use the combo boxes to edit the
superelevation tables/laws (defined in Design Rules in Data
Setup) used to connect transition sections with different
superelevation rates. For more information about
design rules/tables, see Building and Civil Resources in
the Data Setup User's Guide.
When no superelevation value has been set, the
current value displays the information of the previous alignment points.
Design Rules can be selected in session. They allow to define
several horizontal radius tables depending on a superelevation rate. For
example, you can add curve radius rules according to the speed.
-
To create a vertical alignment, click
from the
Alignment assistant.
-
To create a 3D alignment, click
from the
Alignment assistant.
-
To display alignment segment information, click
from the
Railway section of the
action bar
and select an alignment point.
An
Alignment segment information window appears.
You can read information about the start/end point position, elevation, start
direction and segment length.
-
Export alignment information in a report to the format of your
choice by clicking
Export Alignment Report
from the
Railway section of the
action bar.
-
To create a railway surface, select a 3D Alignment in the
tree
or in the
3D area.
-
From the Railway section of the action bar, click Railway
Surface
.
The Railway Surface dialog
box is displayed:
- The Alignment box is filled with the selected
item.
- Select a Rotation axis:
- Center line: The traveled way revolves
about the centerline.
- Inner rail: The traveled way revolves
about the inside turn.
- Outer rail: The traveled way revolves
about the outside turn.
- Select a superelevation Mode:
- Automatic: you can specify the transition
rate which the percentage of the maximum cant in turn achieved
at the beginning of the arc section (basic mode). Transition
computation based on Design Rules from Data Setup that control
runout/runoff lengths based on speed, curve radius,
superelevation and transition rates. A law/sketch is created,
and the slope percentage is applied point by point. See
information about Parameters section below.
- By law: transition sections have a
representation that you can modify. When you select this mode,
other options appear: See the step 11.
- Select:
- Specify some parameters for the Vertical offset from rail
top (a) and the Left/Right shoulder
width (b/c):
When you click one of the three boxes,
this diagram appears:
It displays the offset option (a) which is the vertical distance
between the top rail and the surface to be generated. Shoulders
options (b or c) are the distances between the sleeper end and the
left/right ballast shoulder width.
Select a shoulder option and type a width value to obtain a constant
width. Or uncheck this option and click next
to the shoulder option to define length by a variation law along the
alignment. You switch into the Alignment
Sketcher
app.
Notes:
Only one superelevation rate (one side of the alignment) is
supported for railways.
Superelevation and transition lengths have been defined in cant
tables (design tables provided by default), available in an XML
document (in Design Rules from Data Setup, you can choose the
RailwayAlignmentDesignRules_Default.xml). There is also a script
allowing you compute the transition sections, to manage the
transition/distribution of the lengths along the tangent and
curve (runoff/runout). You can also customise these tables in
Data Setup.
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