AZADPUR TO PREMBARI ELEVATED CORRIDOR

1. • The Public Works Department has a glorious history in the
development of the state since pre independence. The
department is entrusted with construction, maintenance of
Roads, Bridges and Govt. buildings.
• It also acts as Technical Advisor to the State Government in
these matters. Initially, Irrigation, Public Health engineering
were units of PWD.
• Since the inception of the Department, it has strived through
its continuous quest for excellence and putting milestones in
the feat of Engineering.

2. Flyover: - It is a bridge that carries one road or railway line
above another either with or without subsidiary roads, for
communication between the two.
WHAT IS FLYOVER BRIDGE

3. REASON BEHIND GOING FOR A FLYOVER
• 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.
• The six- lane corridor, which is 1.6 km long, on Ring Road is
expected to cut down commuting time as it will bypass three
major traffic jam intersections at Ashok Vihar, Shalimar Bagh
and Keshav Puram

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

5. MAJOR COMPONENTS OF FLYOVER
• Pile
• Pile cap
• Piers & Abutments
• BridgeDeck
• Pedestal
• Bearing
• Parapets (Bridge Railings)

6. COMPONENTS OF FLYOVER

7. FOUNDATION
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. Pile foundation is one type of deep foundation. It is
used where the good soil is at higher depth (10 or 15m) or soil
having low bearing capacity. Pile is also used for tall structures.
In pile foundation the load coming from the super structure is
taken by pile cap and equally distributed in no of piles, pile
transfers this load into the soil.

8. DESIGN OF FLYOVER
All roads, flyovers, etc are designed solely to accommodate the
heaviest and tallest vehicle: the fully loaded truck, thus resulting
in a gross over design for cars. The slab of a flyover is designed to
withstand the 20 tonne weight, (dynamic load) of a fully loaded
truck. This results in a slab with box girders that are about 2-
3metres deep. Similarly the clear height of the flyover slab is
based on the requisite 7-9metres clearance for a truck. The
finished slab of the flyover is at +9-12metres. The slope of the
flyover ramp is also calculated on the basis of a 1:20 gradient, on
the basis of a truck. However, a slope of 1:10 would provide
comfortable access for cars. The cost saving alone in the
embankments would be considerable. Similarly, by factoring
segregation of traffic into design for each aspect, there would be
enormous design optimisation and concomitant cost saving.

9. PLAN SHEET

10. SALIENT FEATURES
Project Estimated Cost 257cr
Project Total Cost 150cr
Agency PWD
Consultant SIMPLEX PVT.LTD
Date of commencement JUNE,2013
Stipulated date of completion 10 NOV,2015

11. PHYSICAL FEATURES
Total Length of the Flyover 1.6km
Width of Flyover 21m
Length Of Column 6.5m
Length of Pile 33m
Spine 6.1m
Wing 9.1m

12. No. of Spans 14
No. of Piles 303
No. of Pile caps 31
No. of Pier and Pier caps 31
Spine Casting 368
Wing Casting 736
Segment Erection 30
Wing Erection 30*2 span

13. COMPLETE WORK STATUS OF PREMBARI
AZADPUR FLYOVER

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

15. These precast units are installed through a Bridge Launcher Machine

16. PRE-STRESSED CONCRETE
• Prestressed concrete is the one in which there have been
introduced internal stresses of such magnitude and
distribution that the stresses resulting from the external load
are counter balanced to a desired degree.
• Pre stressing can be accomplished in three ways: pre-
tensioned concrete, and bonded or unbonded post-tensioned
concrete.

17. PRE-TENSIONING
• In this method of prestressing in which tendons are
stretched /tensioned before the placement of concrete.
• Prestress is imparted to concrete through bond
between steel and structure.

18. POST-TENSIONING
• In this method of pre stressing tension is applied to tendons
after the concrete has been set and hardened. Here the pre-
stress is imparted to concrete through bearing.

19. Prestress Post Tension Anchor Prestressing Equipments

20. ROAD WORK
• 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.

21. SOME PRECAUTIONS DURING INDUSTRIAL TRAINING
• Always wear a good quality helmet on the site.
• Always wear shoes on the site.
• Wear safety belts if required.
• Safety nets should be provided wherever it is necessary

22. AZADPUR FLYOVER

23. THANK YOU