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Alignments and profiles drafting 101

Anonymous

Alignments and profiles drafting 101

Anonymous
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Imagine some one gives you a road way plan and profile sheet. Relatively simple, straight road with no vertical curves.

Runs from station 0+00 to station 10+00.

In the profile you have Proposed LT TOC & RT TOC profile. And existing ground at ROW LT & RT.

In the plan view you have call outs for LT TOC & RT TOC offset. But, since the road varries, sometimes it's 13.5' offset, sometimes 15.0' offset. Meaning the TOC profiles are following an imaginary alignment that is not parallel to the stationed horizontal CL alignment.

Never mind if it's constuctable or how much the deviation effects elevations. Forget how that would effect cooridors and cross sections. From a purely drafting civil engineering 101 point of view, what would you think?

Is this something commonly (or rarely) done, but understood and doesn't cause any concern? Or would you think the people that put out the plans have no idea how alignments and profiles work?
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Joe-Bouza
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I'm going to do my best to not drag ant profession through the mud.

There are people that do not do roadwork but may get work associated with a road and by hook or by crook they get the contract to design a road.

What could go wrong and how difficult can it be .... we put spot elevations and curvy contours on site plans all the time.... how can it be any different. We will just pull out our rubber scale and French curves and make a plan, some elevations here some there.... what could go wrong? They build the parking lots from our plans right?

Well the truth is it is just a road... from a lay persons point of view of course. As highway engineers we like calculated grades and symmetry , lots of symmetry. After all it's has to be buildable, we have to quantify it anput our tails on the line when things don't add up.

Well the reality is there are men and women in the field that just know how to do it.... they don't need no stinking plans....we bid the job win the the bid and worry about the change orders later... after all it's just a road .

Of cours I'm not talking about a super highway and pretty sure you weren't describing one either.

I used to do local roads and had these p&p sheets with data bands of BOW, FOW, TOC, BOC, mid, CP; left and right every 20 feet. I went to field to see how it was going and the job was almost done and looked pretty good. I started talking with the contractor and one thing led to another and I mentioned the data bands and the contractor said: oh... is that what that is for? ... I was flabbergasted and the contractor said hey... it's just a road.

Trust me I am by no means trivializing our profession. It's just that IMHO if the job comes in on budget and doesn't pond ... no one gives a hoot about all our profiles, sections , assemblies, qto, and infrworks cloud blah blah bla

Joe Bouza
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