Selection of Site for Bridge

◆SELECTION OF SITE FOR BRIDGE◆

Following factors should be taken into consideration –

•Connection with existing structure- it should form a proper link with the existing roads or

other means of transport.

• Available foundation , embankment, approaches- Good foundation should be available at a

reasonable depth for the super structure of bridge.

• Angle of crossing river, width of section at crossing- At bridge site the width of river should

be minimum , so that length of the bridge will be less. As well as the bridge should cross the

river flow at right angle also called -normal crossing—square crossing.

• Velocity & discharge of flow passing and freeboard available – These factors play vital role

when the bridge is to be constructed on a navigational channel. If velocity of river flow is less

than that of standard velocity then silting will take place, and if its more than the standard

then scouring will occur.