Method Of Providing Superelevation

Method Of Providing Superelevation

Introduction of superelevation on a horizontal curve of a road is an important feature in road construction. Superelevation is provided in the following two methods.

  1. Elimination of the crown of the cambered section.
  2. Rotation of pavement to attain full superelevation.
Method Of Providing Superelevation
Method Of Providing Superelevation

Read More: Purposes of Providing Superelevation

1. Elimination of The Crown of The Cambered Section

In this method, the outer half of the camber is gradually decreased. This may be done by two methods.

In the first method, the outer half of the camber is rotated about the crown at the desired rate such that the surface falls on the same plane as the inner half.

Elimination of The Crown of The Cambered Section

In the second method, the crown is progressively shifted outwards. This method is not usually adopted.

Second method of Elimination of The Crown of The Cambered Section

Read More: How to Calculate Superelevation: Problem & Solution

2. Rotation of Pavement To Attain Full Superelevation

In this stage, superelevation is gradually provided over the full width of the carriageway so that the required superelevation is available at the beginning of the circular curve.  The different method employed for attaining the superelevation is as follows:

A. Revolving Pavement About The Center Line

In this method the surface of the road is rotated about the center line of the carriageway, gradually lowering the inner edge and rising the upper edge. The level of the center line is kept constant. This method is widely used.

Revolving Pavement About The Center Line

B. Revolving Pavement About The Inner Edge

In this method, the surface of the road is rotated about the inner edge, raising the center and outer edge.

Revolving Pavement About The Inner Edge

C. Revolving Pavement About The Outer Edge

In this method, the surface of the road is rotated about the outer edge depressing the center and inner edge.

Read Also:

 Analysis of Superelevation Formula as Per I.R.C

 Maximum And Minimum SuperElevation As Per I.R.C