Alignments and profiles drafting 101
Not applicable
05-05-2017
06:07 PM
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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?
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?