This presentation abou the flyover construction

1. PCE 355
INDUSTRIAL
INTERACTION
F L Y O V E R / H I G H L E V E L R O A D
B R I D G E C O N S T R U C T I O N
Presented By – Aman Rawat
Roll no. – 21000090107045
B.Tech Civil Eng.(3rd year)

2. Organization-
CONSTRUCTION
DIVISION,
PWD, DEHRADUN
Under Supervision of
Junior Engineer: Mr.
D.S. Karunga
DURATION OF TRAINING:
26 JUNE TO 25 JULY, 2023

3. • INTRODUCTION
• ADVANTAGES
• DISADVANTAGES
• COMPONENTS OF FLYOVER
• Description of Components
• Steps of Construction
3
Content

4. Introduction
 In this presentation I will try to present my 1
month internship study of flyover
construction/flyover components study.
 I observed and learned the construction
processes of a flyover highway.
 A flyover bridge is a type of bridge
that crosses over an existing road
or intersection. It's also known as an
overpass or an elevated roadway..
4

5. WHAT IS A FLYOVER BRIDGE?
5
• A flyover bridge, also known as an overpass or an elevated roadway,it is a type
of bridge that is built over an existing road or intersection. It allows traffic to
pass over or under existing roadways or other obstacles, such as waterways or
railways, without having to stop or cross at the same level.
• Flyover bridges can be built using various materials, such as concrete, steel, or
composite materials. They are designed to accommodate a wide range of
vehicles, from cars and trucks to buses and even trains, depending on their
purpose and location.
• The cement used in flyover construction should be OPC (ordinary Portland
cement). OPC cement is highly durable and sound concrete due to the very low
percentage of alkalis, chlorides, magnesia, and free lime in its composition.

6. TYPES OF FLYOVER BRIDGE
6
 Flyover bridges classified according to their forms.
• Overpass flyover
• Underpass flyover
 Flyover bridges classified according to the material used in
their construction.
• Composite flyover
• Steel flyover
• Concrete flyover

7. ADVANTAGES
7
1.It is useful for traffic management.
2.Reduces travel time due to less congestion.
3.Improves pedestrian safety.
4.Provides space for emergency vehicles to move
quickly.

8. DISADVANTAGES
8
1.They typically require a large space; thus built-up
environments are not good for them.
2.Though the accident risk is reduced, the damage will be
significant, if one does happen. There is a lower chance of
survival in accidents since the vehicle is at a height.
3.It is extremely expensive to construct.
4.Lack of proper management in the flyover construction
may cause many problems.

9. COMPONENTS OF FLYOVER BRIDGE
9

10. COMPONENTS OF FLYOVER:
• FOOTING (Foundation)
• ABUTMENT
• PIER
• PIER C A P
• ELASTOMER BEARINGS
• WEARIN G SURFACE
• CONCRETE DECK SLAB
• BARRIERS.
• R.C.C GIRDERS (Box).
• SEISMIC RESTRAIN ER.
10
 T h e f l y o v e r c o n s i s t s o f n u m b e r o f
s p a n s w i t h c o l u m n s ( p i e r s ) , d e c k
s l a b , g i r d e r s a n d a b u t m e n t s e t c .
 To t a l h e i g h t o f t h e s t r u c t u r e
p r o v i d e d a s 6 . 2 5 m .
 G r a d e o f c o n c r e t e a n d s t e e l
p r o v i d e d a s M 3 5 a n d F e 4 1 5
r e s p e c t i v e l y.
 D i a m e t e r o f t h e p i e r t a k e n a s 2 m .
 T h i c k n e s s o f t h e d e c k s l a b 0 . 3 m
p r o v i d e d .
 W i d t h o f t h e c a r r i a g e w a y i s 7 . 5 m
Structural Information (IS: 456-
2000 and IRC: 21- 2000).

11. FOOTING (Foundation)
title 11
• Since the bridge has to carry a big live
load and its dead weight is also very large
so we cannot go for simple foundation but
pile foundation.
• The piles are 600 mm dia, 20m
depth M-35 grade cast in situ piles.
• The pile cap is proposed of M-35
grade.

12. ABUTMENT
title 12
• The abutment of flyover are used to carry
the vertical and horizontal loads from the
superstructure to the foundation.
• The location of the site and the function of
the need determine which abutment is
utilized in the bridge.
• The minimum wall thickness for abutments
is 2 ft. The minimum footing thickness is
normally 2 ft - 6 in. When the wall thickness
at its base becomes 3 ft or greater, the
footing thickness is to be increased to 3 ft.

13. PIER
title 13
• The Piers, are the vertical support
structures of bridges. They are the
intermediate supports, whose function is to
transmit the forces they receive from the
load-bearing elements to the foundations.
• The height of the pier varying due to the
change in grade.
• The piers are M- 35 grade circular.
• The cross section is of 4m long and 3.4m
wide.

14. PIER CAP
title 14
• Pier caps are horizontal structure member
used for transferring deck load to pier.
• Pier caps transfer the loads from the
superstructure to the piers. They hold the
bridge girders on bearing pads and
disperse the loads from the bearings to the
piers.

15. ELASTOMER BEARI NGS
title 15
• The purpose of the elastomeric bearings is to
support a bridge or other heavy structure in a
way that permits the load to shift slightly, in a
horizontal direction, relative to the ground or
foundation.
• Of all structural bearings, elastomeric
bearings are frequently used elements to
support concrete superstructures and
transmit the loads to the substructures.

16. WEARING SURFACE
title 16
• A wearing surface is the top surface of a
concrete slab, on which the racking and
traffic operate; it can consist of the original
concrete floor, screeds, dry shake toppings
or a polished finish etc.
• The minimum thickness of DWS at any point
is 85 mm consisting of 10 mm bituminous
waterproof membrane and 75 mm asphalt.

17. CONCRETE DECK SLAB
17
• Deck slab is the part of super structure of bridge which is constructed over the
Girder that transfer the live load of vehicles to the sub structure and
substructure further transfer the load to the foundation.
• Most local concrete patio professionals suggest a thickness of 100mm.

18. BARRIERS
title 18
• Their main purpose is to restrain
an errant vehicle from falling off
the structures.
• Height of barrier should be
between 0.5 - 1 meter.

19. R.C.C GIRDERS (Box).
title 19
• The box girder normally
comprises prestressed concrete,
structural steel, or a composite of
steel and reinforced concrete. The
box is typically rectangular or
trapezoidal in cross-section.

20. SEISMIC RESTRAINER.
title 20
• The designed Seismic restrainers
can limit the relative
displacement between
superstructure and piers to the
allowable displacement.
• It prevent the effects of
earthquake on flyover bridge.

21. Timeline
21
Site inspection
and planning
Before construction
begins, planners must
test the site for soil near
the bridge site for
strength, depth, land
layout and other
elements to ensure the
safety and durability of
the final structure.
Setting the
foundation
Workers break ground
on the job site and begin
installing the bridge’s
foundation. Builders
choose a stable location
or drive supporting piles
into the ground and
install solid. These piers
are typically made of
concrete and can
support immense
amounts of weight.
Installing piers
and bridge
support
Once the bottoms of the
bridge piers are in place,
crews build upward until
each pier has reached
its predetermined
height. Once the piers
get installed, it’s time to
add supportive
structures like the
abutments,
Completing the
superstructure
The superstructure
includes all
components that
directly receive the
load, including girders,
arches or suspension
cables, depending on
the bridge type. Then
it’s time to build the
bridge deck and
roadway.
Final quality and
safety inspection
Once construction is
complete, crews perform
safety tests using
cranes and bridge
booms to ensure that
the structure meets all
quality standards. These
tests allow engineers to
rule out any structural
flaws and move forward
with installing the final
paving and electrical
systems.

22. Presentation title 20XX 22