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The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals - Leaving Cert DCG - Question C-1 - 2013
Question C-1
The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals. (a) On the drawing supplied, draw a vertical secti... show full transcript
Worked Solution & Example Answer:The accompanying map, located on the back page of Section A, shows ground contours at 5 metre vertical intervals - Leaving Cert DCG - Question C-1 - 2013
Step 1
On the drawing supplied, draw a vertical section (profile) on the line AB.
Answer
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Measure Heights and Draw Horizontal Lines:
- Utilize the contour lines provided to measure vertical heights along line AB.
- Draw horizontal lines at each height intersecting line AB to determine the elevations.
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Projections from Intersections Between Line AB and Contours:
- Identify the points where line AB intersects the contour lines.
- From these intersection points, project horizontal lines to the left of the profile to indicate the elevations of the contour lines.
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Draw Outline of Profile:
- Connect the projected points to form a continuous line that represents the vertical profile along line AB.
Step 2
Using side slopes of 1 in 1 for both cuttings and embankments, complete the earthworks on the northern side necessary to accommodate the roadway.
Answer
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Parallel Lines at 5m Intervals:
- Draw parallel lines along the northern side of the proposed roadway at 5m intervals to represent the earthwork levels.
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Identify Points on Cutting Curve:
- Based on the roadway's slope, identify and mark points on the cutting curve needed for the design.
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Identify Points on Embankment Curve:
- Similarly, mark the points on the embankment curve where the earthworks will transition from cutting to embankment.
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Draw Earthworks Curve:
- Using the identified points, sketch the earthworks curve on the drawing to show the necessary modifications to the terrain and ensure it meets the roadway design criteria.