Describe the method of setting out simple curve by using the method of offset from long chord with sketch.

Describe the method of setting out simple curve by using the method of offset from long chord with sketch. 
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1 Answer

Answer :

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Given data: Direction of two straights, chainage of point of intersection, radius of curve.

Procedure:

 1) Set theodolite over B and measure deflection angle Ф

 2) Calculate tangent length by formula R x tan (ϕ/2).

 3) Locate first tangent T1 point by measuring backward along BA distance equal to tangent length and second tangent point T2 by measuring forward along BC distance equal to tangent length.

 4) Divide long chord into even number of equal parts. 

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