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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 - 2016
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 - 2016
Step 1
Draw a vertical section (profile) on the line AB
Answer
To draw the vertical section along line AB, follow these steps:
- Measure Heights: Begin by measuring the heights at the intersection of line AB with the contour lines on the map. For every 5-meter interval, draw a horizontal line.
- Projection from Contours: Project the intersection points between line AB and the contour lines down to your horizontal lines, marking the corresponding height values.
- Outline the Profile: Connect the points smoothly to represent the profile. Ensure to maintain the scale used in the original map.
Step 2
Using side slopes of 1:1, complete the earthworks on the northern side
Answer
To complete the earthworks:
- Determine Cut/Fill: Identify where the proposed roadway (CD) is situated at an altitude of 35m. Compare this with the existing ground profile determined in part (a).
- Identify Points on Cutting Curve: For the areas where cutting is required, use a slope of 1:1 (1m vertical drop for every 1m horizontal) to mark points on the cutting curve extending outward from the edge of the roadway.
- Identify Points on Embankment Curve: Likewise, for embankments, ensure to extend from the roadway's edge to create points along the embankment slope using the same 1:1 slope ratio.
- Draw Earthworks Curves: Finally, connect these identified points to clearly illustrate the required earthworks for both the cuttings and embankments, ensuring the curves are smooth and represent the intended transitions.