Flyover Bridge

Basic Types Of Bridge

What Is Flyover Bridge

Types Of Flyover Bridge

Components Of Flyover Bridge

Merits And Demerits

Top Flyovers Of India

Conclusion

Suspension Bridge

Cantilever Bridge

Arch Bridge

Truss Bridge

Girder Bridge

FLYOVER BRIDGE

What Is

FLYOVER BRIDGE

It is a bridge that carries one road or railway line

above another either with or without subsidiary

roads, for communication between the two sides.

As the traffic on the road goes on increasing and we don’t have

any space left in both the dimensions, then the only option

left will be to go to the third dimension and that is done

through flyover construction.

TYPE OF FLYOVER

BRIDGE

Road

Crossing

Simple Flyover Cloverleaf Junction

Railway

Crossing

At railway crossing where there is high traffic congestion in terms of the

frequency of trains passing by or the traffic on the road, in both the cases the

flyover should be provided along the road. Here the flyover becomes

indispensable.

Simple Flyovers

In this case, the main road is used for fast traffic, which is made to pass at a high level by a bridge, providing ramps on both the approaches; and the slow

traffic is made to pass underneath. Thus the traffics pass at two different levels, and leave no chance for an accident.

It requires a very large area of land. All conflicting streams of traffic are avoided, and so traffic can move at its own speed. This is more advantageous than a roundabout, as

there is no necessity for weaving and slowing down of traffic.

SUPER-STRUCTURE: The superstructure

consists of the components that actually span the

obstacle the bridge is intended to cross and

includes the following:

Bridge deck

Structural members

Parapets (bridge railings), handrails, sidewalk,

lighting and some drainage features.

SUB-STRUCTURE:

The substructure consists of all of the parts that

support the superstructure. The main components are

abutments or end-bents, piers or interior bents,

footings, and piling.

Abutments support the extreme ends of the bridge

and confine the approach embankment, allowing the

embankment to be built up to grade with the planned

bridge deck.

Span: The distance between

two bridge supports, whether

they are columns, towers or the

wall of a canyon.

Beam: A rigid, usually

horizontal, structural element

Pier: A vertical supporting

structure, such as a pillar.Beam

Pier

Abutment: A structure to support the lateral pressure of

an arch or span. E.g. at the ends of a bridge.

Bearings: A bridge bearing is a component of a bridge

which connects the piers and deck.

Approach Slab: It provides a transition between the

roadway pavement and the bridge.

Parapet: A low protective wall along the edge of

bridge.

Merits of flyover

Flyovers play a major role in streamlining the traffic

control system.

Through flyovers plenty of time is saved avoiding

congestion.

Pollution effect is reduced.

Flyovers reduce the risk of accidents

Flyovers also contribute a lot to the aesthetics of the

city. The persons traveling on the flyover can enjoy

the panoramic view of the city.

Demerits of flyover

Flyovers are not as a rule suitable for built up areas as they require a large area and also it is costly.

Lack of proper management in the flyover construction may cause many problems.

Loss in the case of accidents is increased. The risk of accidents is reduced but in case an accident occurs the loss may be more. As the vehicle is at a high elevation, during accidents there is more chance of losing life.

As the people who cannot risk their lives in relying on it are not using it. So, it’s ironical that the flyover has become a liability here instead of an asset for the city.

Demerits of flyover

Flyovers are not as a rule suitable for built up areas as they require a large area and also it is costly.

Lack of proper management in the flyover construction may cause many problems.

Loss in the case of accidents is increased. The risk of accidents is reduced but in case an accident occurs the loss may be more. As the vehicle is at a high elevation, during accidents there is more chance of losing life.

As the people who cannot risk their lives in relying on it are not using it. So, it’s ironical that the flyover has become a liability here instead of an asset for the city.

Kathipara Junction:- Kathipara Junction is an

important road junction in Chennai, India. It is located at Alandur, (St.Thomas Mount), south of Guindy, at the intersection of the Grand Southern Trunk Road (NH 45), Inner Ring Road, Anna Salai and the Mount-PoonamalleeRoad. Kathipara flyover is the largest cloverleaf flyover in the whole of Asia.

Hebbal Flyover -Bangalore: Bangalore The

‘Garden city of India‘ has some of the great flyovers. Bangalore electronic city flyover is the biggest flyover in India. Hebbal Flyover connects connects the Outer Ring Road and Bellary Road and is one of the best double road flyover.

We can increase the level of service of road by

providing flyover in urban corridors.

To satisfy the present and fulfill future demands of the

traffic.

For orderly movement, left turning and right turning

maneuver can be provided.

The capacity of road (vehicles per km) can be increased

without changing road geometrics.

To provide easy, fast and safe access of public

transportation service.

To reduce the congestion of traffic in a particular area.

To minimize the number of accidents.

To reduce the travel time of vehicle or road user.

To make a clearance for people walking on the side of

the road.