A detailed presentation on the construction of the flyover in Patna

1. 1
National Institute of Technology Patna
Presentation for Major Project (8CE195)
On
CONSTRUCTION OF FLYOVER IN PATNA
Presented by
Narayan Gupta(1403037)
Mahendra Kumar(1403089)
Akhilesh Rajpoot (1403016)

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Construction of flyover
1. Connecting Mithapur flyover to Bhikhari Thakur flyover via R-Block junction (166 crores)
2. Connecting Mithapur flyover to Chiraiyatand flyover via karbigahiya (121 crores)
Client
Bihar Rajya Pul Nirman Nigam Ltd. Patna
Contractor
Rachna Construction Co. Bharuch, Gujrat
Project Detail

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Introduction
1 2R-Block junction karbigahiya

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What is flyover?
A bridge over another road
Allowing traffic without interruption
with its approaches on both side
Super structure
Substructure
Foundation
Girder
Pier Cap
Pier shaft
Pile cap
Pile

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Execution of Project
Sequence of construction
1. Surveying
2. Analysis and design of the structure
3. Piling and Pile cap Construction
4. Construction of Pier shaft and Pier cap
5. Construction of Pedestal and seismic stopper
6. Launching and gluing of segments
7. Construction of road over bridge

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SURVEYING (TOPOGRAPHICAL SURVEY)
Topography is used to locater and determine
the position of any point in both the horizontal
and vertical coordinates.
various maps are studied and then detailed is
done by Total station (TS) and layouts are
given on AutoCAD.
By using AutoCAD we can find the
coordinates(north, east) and reduce level of
any point.
Coordinates of any point is marked with the
help of Total station.
Reduce level (RL) is marked by using Auto
level.
Circular mark on ground with
nail to represent a particular
coordinate and RL

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Auto level to mark the RL
Total Station to mark coordinate

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Piling
Type of pile - Bored Cast in-situ concrete piles
Code of practice - (IS 2911-part 1-section 2:2010)
1- Point is located on ground to start the excavation.
2- Soil is excavated by auger at located point and
liner(length 2-3m) is inserted.
FOUNDATIONS: Foundations are the structures
which are constructed below existing ground level. It
sustains the loads coming from the sub structures and
superstructures. Bridges had to carry a big load so PILE
FOUNDATION are preferred
Auger
Liner

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3- Flushing is done using bentonite slurry
and bentonite is also used for the
stabilization of bore hole and boring is done
upto desired depth (30m-34m).
Bentonite
Tank for mixing of bentonite and waterHydrometer

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4- boring is done by RIG machine(MAIT) and Bucket.
Rig machine
Bucket

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5- formation of cage
Dimension and Reinforcement Detail for pile
Cage
Cover block

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6-Shifting of cage into borehole

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7- Manner of concreting which shall be by use of tremie
Tremie pipe(dia 200mm)-
for flushing and concreting
TM
Concrete pouring from TM into tremie
through hopper
Insertion of tremie pipe

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Pile cap
1-Excvation of Soil for pile cap

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2- Chipping of extra unsound concrete of pile that is above cut off level
And PCC is done at cut off level (thickness of PCC-100mm)

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Hexagonal Pile cap
Rectangular Pile cap
Scaffolding for reinforcement work of pile cap

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Reinforcement For Hexagonal Pile capReinforcement of Rectangular Pile Cap
Reinforcement of Pile Cap (4 type)

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Drawing and BBS of Pile Cap

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Cleaning and
lubrication of formwork
Assembling of
formwork
With clear cover of
75mm

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Location of pier shaft is marked using total station
Vertical bar of pier shaft are placed in to marked location

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Pouring of concrete and compaction of concrete using immersion vibrator
Workability is checked by slump test before pouring and sample is collected for compressive strength

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Shear key is made at construction joint
Unloading of formwork
Curing of pile cape

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After 28 days of pile cap casting , the paint of epoxy coal
tar Is applied to the surface of pile cap to make the
surface impermeable
Instead of using paint, grade of concrete is increased to
M- 45

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Pier Shaft
Drawing and detailing of pier shaft BBS of pier shaft

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Pier Shaft
Assembly of reinforcement for first lift Cleaning and lubrication of formwork and it is applied

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Pouring of concrete using pump and TM
Workability is checked before pouring and cubes are casted
for compressive strength
Vertical pipe is used to prevent the
segregation of concrete

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Reinforcement is done for second lift
Formwork is placed using hydra and pouring is done

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Pier Shaft Curing of pier shaft is done using jute bag (sprinkle method)

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Pier Cap and Portal beam of rotary is under construction….

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Test
1- sample of concrete is collected at the time of pouring.
workability is checked by slump test.
for compressive strength of concrete, cube are casted and sent to lab for testing
Slump cone

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Pile load test
Routine test
As per 2911 (part 4):1985
It is carried out on a working
pile with a view to check
whether pile is capable of
taking the working load
assigned to it.
The number of tests may
generally be one-half percent
of the total number of piles
required.
In this test compression load
is applied to the pile top by
means of a hydraulic jack
against rolled steel joist and
suitable load frame capable of
providing reaction and the
settlement is recorded by dial
gauges.
Dial gauge
Hydraulic jack
Kentledge
Maximum allowable settlement is 12 mm

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Pile Integrity test
Non destructive pile integrity test (PIT)
using low strain integrity test
As per IS 14893:2001
This test is performed for confirming the
integrity of pile upto full depth

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Supervision
-Helmet, jacket and shoes
for all employs and worker
-Barricading, Instruction
board, light, reflector, safety
cone, flag
-safety belt is used if any
worker is at height more
than 2m from ground
Safety

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Supervision
Quality control
• Quality of Concrete--- workability and strength
compaction of concrete using immersion vibrator (IS 3558:1983)
curing
• Steel --- reinforcement as per drawing and BBS, dia and length of bar, spacing of bar,
lap length, binding of bar, development length, coupler, clear cover.
• Other material --- lubricant, bentonite, coal tar epoxy, paint etc.

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Concrete material
Pile M 35
PCC M 15
Pile cape M 40
Pier shaft M 50
Clear cover to the reinforcement shall be
a) Pile cape - 75mm
b) Pile - 75mm
c) Pier - 50/75mm
Minimum lap length
Pile = 54d
Pile cape = 51d( for bottom and side face reinforcement)
=78d (for top face reinforcement )
Pier = 44d
d- Diameter of smaller bar being lapped
Steel
TMT bar (Fe 500D)

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Cutting and bending of steel at yard
Threading for rebar splicing mechanical coupler
Reinforcement Yard

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Batching plant
for production
of concrete
Batching Plant

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Testing machines at lab

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Fabrication of formwork and staging
Fabrication unit

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Machine and Tools
Trailer concrete pump
Backhoe loader
Transit mixture
Water tanker Crawler crane

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Machine and Tools
Rig machine
Hydraulic crane
Immersion
needle
vibrator
Concrete
breaker

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Machine and Tools
Tremie pipe Funnel
Bucket Auger
Liner

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Conclusion
Flyover makes transportation very easy. It becomes very difficult task when there
is a project inside the city. R-block and Karbigahiya are the busiest route of
Patna. In construction of flyover, construction of foundation requires large area
that interrupt the already running traffic.
Some point what we learned at site.
• To analyze the drawing of project and to prepare the BBS from drawing.
• Calculation of required concrete, steel and other material
• Surveying for accuracy of position of different part
• Various site test to ensure the quality of construction
• Safety check for efficient work
• Management of running traffic with the help of local police
• Handling of existing structure like sewer, underground cables and statue.
• Maintenance of data for completed structure

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References
1. IS 456:2000
2. IS 2911 (Part 1/Sec 2):2010
3. IS 2911 (part 4):1985
4. IS 14893:2001
5. IS 3558:1983
Code of practice for plain and reinforced concrete
Design and construction of pile foundations-code of practice (bored cast in-
situ concrete piles)
Codes of practice for design and construction of pile foundations – load
test on piles
Non-destructive integrity testing of piles (NDT)-guidelines
Code of practice for use of immersion vibrators for consolidating concrete

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THANK YOU