Circular Curves in Engineering Survey In the geometric design of motorways, railways, pipelines, etc., the design and setting out of curves is an important aspect of the engineer’s work. The initial design is usually based on a series of straight sections whose positions are defined largely by the topography of the area. The intersections of pairs of straights are then connected by horizontal curves. In the vertical design, intersecting gradients are connected by curves in the vertical plane. Circular curves are used to join intersecting straight lines (or tangents). Circular curves are assumed to be concave. Horizontal circular curves are used to transition the change in alignment at angle points in the tangent (straight) portions of alignments. An angle point is called a point of intersection or PI station; and, the change in alignment is defined by a deflection angle, Δ. Types of Circular Curves are: Simple Curve Compound Curves Broken Back Curves Reverse Curves
Posted on: Sun, 25 May 2014 05:32:48 +0000
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