4-1 Create Template

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Create Rural Template


Typical cross section for road design

The second part of Road Design in 12d Model is the creation of the Design Cross Section, or Template.

As will be discussed in-line with Appendix A – Geometric Road Design.  The Cross Section is the Vertical plane at right angles to the longitudinal road axis.

The Cross Section has a number of features including, Traffic Lanes, Shoulder and Verge areas,
Table Drains and Cut or Fill Batter (interface) slopes.

The Traffic lanes provide adequate space for travel, the number is usually determined by AADT volumes and the lane width affects the roads capacity for traffic.

The Shoulder is provided for safety, allowing some wandering (recovery), emergency stopping and protection of the edge of pavement.

Typical Cross sections are produced on all projects to show the selected elements to be constructed, widths, and slopes and cross falls to be adopted and pavement depths for construction.


A typical road cross section is shown below.

Creating a template - cross section for a road design

The template is created using:                 Design => Templates => Create/Edit.

There are four parts to the template:

  1. Fixed.  This part is fixed by the designer (you!).  This part of the cross section will not change for the length of the road.  It is FIXED.

    After 12d Model completes the Fixed part of the cross section, it checks to see whether the last point on the fixed part (the shoulder in this case) is in Cut or Fill.  If it is in FILL at the edge of the shoulder, then 12d Model goes to the FILL part of the template.  If the shoulder point is in CUT, 12d Model goes to the CUT part of the template.

    It is okay to leave the CUT and the FILL parts of the template blank.  12d Model will automatically move to the Final Cut/Fill part of the template.
  2. Cut.  These instructions are carried out only if the last point on the fixed part of the cross section is in CUT.  In this case the instructions are for the creation of a table drain.
  3. Fill.  These instructions are carried out only if the last point on the fixed part of the cross section is in FILL.  In this case the instructions are for the creation of a verge.

Final Cut/Fill.  After 12d Model completes any instructions in the CUT or the FILL parts of the template, it tests to see if the last point on the cross section (either the verge point or the table drain 2 point in this case) is in CUT or FILL, then carries out the instructions in the ‘Final Cut/Fill’ part of the template.


Type in the template name Rural


Press the Fixed button to display the Fixed Template panel.




Type in the template values for the design cross section.



The Draw button allows users to have the fixed part of the template displayed, and you are able to check the link values that have been entered.



Press Apply to save the Fixed template values.

Press Draw to refresh the diagram of the design links.

Press Finish to exit and finish the panel without saving.

Press OK to save and finish the panel.

Notes:

  1. The level of each point is calculated based on the crossfall or height and is measured from the previous point.
  2. Positive (+ve) height or xfall is up, negative (-ve) is down.

You can define the level of each point by height OR crossfall BUT NOT BOTH.

Create the cut part of the template

The Cut part of the template will be joined to the last link in the fixed part of the template which is

the SH – Shoulder string.




Press the Cut button to display the Variable Cut Template panel.






Type in the template values for the design cross section.




Press Apply to save the Cut template values.

Press Draw to refresh the diagram of the design links.

Press Finish to exit and finish the panel without saving.

Notes:

    1. This part of the template will only be used if the last point on the fixed part of the template is in FILL.
    2. A slope of 1 in 25 is equal to 4%




Press the Final Cut/Fill button to display the Variable Fixed Template panel.





Type in the template values for the design cross section.


Press Apply to save the Final Cut / Fill template values.

Press Finish to exit and finish the panel without saving.

Notes:

  1. The Final cut slope will be created after the last point on the FIXED part of the template, and any links created in the CUT or FILL parts.
  2. The Final fill slope will be created after the last point on the FIXED part of the template, and any links created in the CUT or FILL parts.
  3. The fill slope is given as a positive number, despite the fact that it is sloping downwards.
  4. The maximum slope width is the maximum distance that 12d Model will look/search for the natural surface tin.  
    If the tin is not found after 100m, 12d Model will stop looking, and create the int point at the last template string.
  5. The name of the interface string will be int.