This project’s aim was to decrease
train times by increasing rail curve radii in order to increase speed on the
north coast rail line from Newcastle to Brisbane. The project included a large
number of selected sites within this length of rail slewing from 1 to more than
5 curves per site.
The client requested
benching/terracing to be modelled in 12d Model for accurate volumes, and
construction setout as the rail embankment needed to be constructed in 600mm
layers. They had had problems in the past with this area being overlooked and
volumes being inaccurate, so URS needed a very easy to apply, uncomplicated
dynamic for design changes, and a non-time-consuming way of doing this as it was
required on almost all of the 50+ sites for the project.
Setting up a template that would
need to be constantly modified by inserting/omitting strings due to changes in
heights of the embankment, and also widths of benching,
etc., was not optimal,
nor was setting up a decisional template as it would be too full of glitches and
hard to modify for specific cases, inaccuracies in the survey,
The idea then came to fix the
problem by using a variable fill template that would add and omit benching steps
as the embankment heights changed, making it dynamic and very easy to work with,
plus making it easy to modify benching widths, useful if
e.g. there were a flat
section as part of the embankment.
A Dummy embankment
foundation function was created to be the base of embankment works. This was
hinged off the proposed toe of the embankment and offset due to topsoil
removal. A tin was then created from this.
A template with the
benching/terracing strings placed all within the ‘fill’ section of the
template was created. The template could contain 50+ strings to allow for
embankments of any size.
This very simple but effective
solution was used in over 50 sites on the project, and worked very well. It is a
great example of 12d Modellers ‘thinking outside the box’.
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