Technical Drawing - Exam Papers - Higher - 2007 - Building

Question 7

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The accompanying drawing shows ground contours at five-metre vertical intervals.
ABCD is the line of a proposed roadway. O is the centre of the circular arc.

The roadway has the following specification:-
(i) formation width is as shown;
(ii) formation level at B is 40m;
(iii) A to B is level;
(iv) gradient B to C rising uniformly, to a level of 55m at C;
(v) gradient C to D, 1 in 15 falling;
(vi) side slope for cuttings is 1 in 1.5;
(vii) side slope for embankments is 1 in 2.

(a) On the drawing supplied, show the earthworks necessary to accommodate the roadway.

(b) Determine, using a graphic method, the gradient of the roadway between B and C.

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