This project report details the construction of a flyover in Bihar, including the design and engineering specifications, such as pile foundations, pile caps, and concrete segments. Key elements include the use of pot bearings for stability, a crash barrier for safety, and a reinforced earth wall for enhanced structural integrity. The report emphasizes the importance of proper compaction techniques and provides various dimensions and materials used throughout the construction process.

1. A PROJECT REPORT ON FLYOVER CONSTRUCTION
AT
BIHAR RAJYA POOL NIRMAN NIGAM LTD.GOVT OF
BIHAR
SUBMITTED BY:- SUBMITTED TO;-
AKHILASH KUMAR DR.SHEETAL AGARWAL
CIVIL ENGG.(VIIth sem.) ( HOD OF CIVIL ENGG.)
ROLL NO:-12EAYCE005
DEPARTMENT OF CIVIL ENGINEERING
ARYA COLLEGE OF ENGINEERING &RESEARCH CENTRE
SP-40, RIICO INDUSTRIAL AREA, KUKAS, JAIPUR, RAJASTHAN
RAJASTHAN TECHNICAL UNIVERSITY, KOTA

2. Company : BIHAR RAJYA POOL NIRMAN NIGAM LTD.
Project Name : FLYOVER CONSTRUCTION
Location : MITHAPUR FLYOVER TO CHIRAIYATAND
&
CHIRAIYATAND TO GANDHI MAIDAN
Estimated cost : 100 Cr.
PROJECT DETAILS

3. PILE
As we know PILE is a column (of reinforced
concrete) which transfers the load of
superstructure directly to the soil strata.
The piling is necessary to make the foundation as
well as soil strata reliable to withstand the load
conditions more safely.
Before installation of END BEARING PILE,
settlement under Pile Load Test was observed in
between 6-12mm which shows the green signal to
install.
NOTE- In pile foundation, 10% cement more is
required.

4. PILE

5. PILE –CAP
A thick concrete mat that rests on piles
collectively to provide a suitable stable
foundation is Pile Cap.
It is 1.8m thick and 5.2m wide.

6. PILE –CAP

7. PIER
A vertical supporting structure over pile cap is
Pier Shaft.
The thickness is provided according to
drawings.
NOTE-
Shaft dimension is 1500mm x1500mm at
Exhibition road site.

8. PIER

9. ABUTMENT & A.CAP
Abutment are typically used where column
lengths on multi-column piers will require
larger column sizes due to slenderness.
Abutment are also an option where stream
flow could result in debris build-up between
columns of a multicolumn.

10. ABUTMENT

11. PEDESTAL
Pedestal is an independent support to bearings,
over Pier/Abutment Caps.
NOTE-
• Pedestal dimension is 950mm x850mm
x250mm.
• The number of Pedestal over a Pier Cap is 4.
• The number of Pedestal over a Abutment
Cap is Wall. 2 with a Dirt

12. PEDESTAL

13. BEARING
The bearings used in the construction are Pot
Bearings. Pot bearing is named so because bearing
is confined in a steel pot.
Although it has some specific characteristics
which tend an engineer to use it. These are as-

14. • Negligible vertical deflection as only 0.06”.
• Uniform loading acceptability.
• Minimal load eccentricity as up to 3% of the
disc diameter.
• Having least resistance in the range of 0.01 to
0.022 radians.
• Lower peak pressure on bearing seats due to
hydraulic design principle, characteristic load
distribution curve is flatter.
• High horizontal load capacity.

15. BEARING

16. SEGMENT
A flyover segment is the roadway surface of the
flyover.

17. These segments have shuttering formwork made
of high strength steel which are cast in casting
yard.
SHUTTERING
FORMWORK OF
SEGMENTS

18. These precast units are installed through a Bridge
Launcher Machine.
SEGMENTS INSTALLED
BY LAUNCHER
MACHINE

19. GLUING BETWEEN SEGMENTS
After gluing, the segments are connected through
strand bars (15.2mm dia.). The process is termed
technically as “Threading”
STRAND BARS

20. NOTE-
• There are 10 holes on each face of the segment.
• Each hole comprises of 19 bars of 15.2mm dia.
• The overall threading of a span is parabolic due
to variation of hole’s position of segments lying
over the span.
• After this post tensioning is done to make it a
pre stress unit using tendons.

21. CRASH BARRIER
The barrier which checks errant vehicles from
jumping outside from the flyover is called as Crash
Barrier/Traffic Barrier.
The width of Crash Barrier is 500mm.

22. FACIA PANEL
The facia panel is the smallest unit of reinforced
earth wall.
It is a precast unit containing bricks and concrete
with covering.

23. REINFORCED EARTH WALL
The Reinforced Earth wall is made up of facia
panels. These panels are arranged in the same way
as of brick’s bonds.
This Reinforced Earth Wall provides 25% more
safety to the superstructure.

24. GEOGRID
Geogrid is a geopolythene material, used to provide
the levelling of sand stratum at its level. There is a
Hook embeded in panel connecting its two front
wall’s hooks with Geogrid by a connecting rod in
each hook.

25. SAND COMPACTION
• Sand compaction is an important work in flyover
a ramp.
• The sand is get self compacted by sprinkling
water over it.
• The compactor machine compacts with 8kN/m2
at the middle.
• The sides are compacted with 1Kn/m2 by a baby
roller or plate vibrator.

26. SAND COMPCTION

27. DIRT WALL /BALLAST WALL
The dirt wall is a wall which stands on the
Abutment cap end to end apart from pedestals.
This wall bears the load of ramp next to RE Wall
on the abutment.
NOTE- The end sides of the dirt wall should be
matched properly with the ends of R E Wall and
thus in the same way till crash barrier.

28. Thank you!
ANY QUERIES ?
Courtesy : Akhilesh Kumar