Rah AFzar Tarh
Company overview
Products
Contents
Training Videos
Free Stuff
Site Map
Contact us
Support services
Home page
|
|
The first property of the “Extended highway” template is the possibility to have two sets of project
lines, one for left and the other for right side. Each of the project lines may
be designed separately and then cross sections are calculated based on them.
Thus a cross section can have two different project levels at left and right
side of its center.
|
The second property of the
“Extended highway” template is the possibility to have two sets of horizontal
alignment, one for left and the other for right side. This way, left and right
routes may have different horizontal arcs, and therefore different super
elevations (devers).
Of course, the “Extended highway” template can be established based on only one horizontal alignment too.
But in situations when a highway needs tunnels in some parts, on those parts, left and right routes
must be separated, thus having different horizontal alignments. Thus left and
right sides of cross sections at these parts have variable median distances,
and normally it starts from zero at the beginning of separation to its maximum
and again get close to reach again to zero at the ending point. This situation
is shown in the following figure.
Because of having different left
and right horizontal alignments, the kilometer (distance from origin) of a
cross section in these parts can be different at left and right sides of the
cross section. Thus in “Extended highway” template left and right kilometers
can be different.
|
|
The third property in “Extended highway” template is the number of bands in this template that is increased in
this template.
Four types of “Extended highway” template named as “A”, “B”,
“C”, and “D” each have multiple bands at each side of the center line.
In addition to median, for type “A” an auxiliary band is added before shoulder
band. For type “B”, after the shoulder there is a special band that may have
vertical gap with regarding to shoulder band. In type “C” the main band itself
is divided to two bands having a passage band in between, and finally type “D”
is the combination of type “B” and type “C”.
|
| Back to Top
|
The last property of “Extended highway” template is the possibility to consider left and right cross sections
as separated or combined.
In situations where the distance between PLs at left
and right is big enough that none of the embankment or excavation lines of left
and right cross sections intersect each other, it may be assumed that left and
right cross sections must be analyzed individually and separated.
This is required especially when encountering a tunnel, and for example left cross section reached to the
tunnel, and right side has not yet. In these situations the there must be a
tunnel shape at left and excavation lines at right, and the cross section areas
and lengths must be calculated accordingly.
Also in some cases, there is a need to have a cross section only for one side of the route, left or right.
These individual one sided cross sections can be specified as “Extended
highway” template too.
|
 |
|
