this presentation contains definition,types,components,advantages and drawbacks of flyover.....thank you

1. Flyover Bridge

2.  Basic Types Of Bridge
 What Is Flyover Bridge
 Types Of Flyover Bridge
 Components Of Flyover Bridge
 Merits And Demerits
 Top Flyovers Of India
 Conclusion

3.  Suspension Bridge
 Cantilever Bridge
 Arch Bridge
 Truss Bridge
 Girder Bridge
 FLYOVER BRIDGE

4. What Is
FLYOVER BRIDGE

5. 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.

6.  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.

7. TYPE OF FLYOVER
BRIDGE
Road
Crossing
Simple Flyover Cloverleaf Junction
Railway
Crossing

8.  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.

9. 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.


10.  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.

12. 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.

13. 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.

14.  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

15.  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.

16. 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.

17. 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.

18. 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.

19.  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-Poonamallee
Road. Kathipara flyover is the largest cloverleaf flyover
in the whole of Asia.

20.  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.

21.  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.

22.  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.