The two grades of a sag vertical curve are –6% and +4%, the curve commences at c
ID: 1711208 • Letter: T
Question
The two grades of a sag vertical curve are –6% and +4%, the curve commences at chainage 350 at RL 26.050 and has a length of 450 m. A large circular concrete pipe drain is situated at right angles to the road centreline at chainage 500.The RL of the top of the drain pipe is 21.955 m. If the drain requires a minimum cover above the top of the pipe of 0.850 m, by how much will the pipe need to be lowered? b. A circular curve with a radius of 500 m is connected by spiral transition curves to 5% superelevation, and the length of superelevation development length is based on a normal crossfall of 3%. The operating speed is 100 km/h. If the chainage of start to superelevation development (SSD) is 650 m, determine the chainage of TS and SC satisfying Austroads design requirements.
Explanation / Answer
Solution of 1
RL at chainage 350 is 26.050 m
RL at chainage 500 at perpendicular of which pipeline is laid
At which hovering slope is -6 and curve length is 500- 350=150 m
26.050-6*150/100
17.05m
Pipe to be lowered by the amount of
21.055 -17.050+.850
4.855m
the
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