CURVES AND ITS NECESSITY

 

CURVES are usually employed in lines of communication in order that the change of direction at the intersection of the straight line shall be gradual. The lines connected by the curves are tangential to it and are called as tangents.

NECESSITY OF CURVES:-

 Straight route of road or track is always desirable, since it provides economy in construction, transportation and maintenance.

But when there is change in alignment or gradient of road or track, then it becomes a need to provide curves under following circumstances.

 1. Excessive cutting and filling can be prevented by providing the change in alignment by curves.

2. The obstruction which came in the way of straight alignment can be made easier by providing by pass with the help of curves.

 3. In the straight route gradient are made more comfortable and easy providing diversions with help of curves.

 4. In the straight route costly land comes in the way then it can avoided by providing diversions with the help of curves.

TYPES OF CURVES:-

          HORIZONTAL CURVES

SIMPLE CURVE

COMPOUND CURVE

REVERSE CURVE

TRANSITION CURVE

COMBINED CURVE

VERTICAL CURVE

SUMMIT CURVE

VALLEY CURVE

 

 

 

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