PPT of BRPNNL Patna summer internship for Civil Engineering

**Title: Summer Internship Program at BRPNNL, Patna - Dual Decker Bridge at Ashok Rajpath**

**Description:**

This presentation highlights my experience during the summer internship program at Bihar Rajya Pul Nirman Nigam Limited (BRPNNL), Patna. The focus of the internship was on the construction of the dual-decker bridge at Ashok Rajpath, a significant infrastructural project in the city.

Key points covered in this presentation include:

- **Project Overview:** Understanding the significance of the dual-decker bridge in improving urban mobility and easing traffic congestion.
- **Technical Insights:** A deep dive into the engineering techniques and challenges faced during the construction phase.
- **Learning Outcomes:** Skills and knowledge acquired during the internship, including practical applications of civil engineering concepts.
- **Collaborative Experience:** Working alongside experienced engineers and understanding the complexities of large-scale infrastructure projects.
- **Future Implications:** How this project will impact the local community and the future of urban development in Patna.

This internship provided invaluable practical exposure, blending theoretical knowledge with on-site experience, and deepened my interest in civil engineering, particularly in innovative bridge construction.

1. AN INTERNSHIP/ TRAINING
PRESENTATION
CONSTRUCTION OF DUAL DECKER FLYOVER FROM
KARGIL CHOWK TO PATNA SCIENCE COLLEGE
Presented by
Niraj Kumar
Niti Kumari
Nitin Anand

2. FLYOVER
REASON BEHIND
GOING FOR
The dual-decker flyover on Ashok Rajpath in Patna is
essential for several reasons:
Traffic Congestion: Ashok Rajpath is a major road with
heavy traffic due to key locations like the Patna Medical
College and Hospital (PMCH). The flyover provides
additional lanes to alleviate congestion.
1.
Efficient Traffic Flow: The dual-decker design separates
local and through traffic, reducing bottlenecks and
ensuring smooth transit for ambulances and emergency
vehicles to PMCH.
2.
Safety: Reduced congestion and better traffic
management lead to fewer accidents, ensuring safer
access to PMCH.
3.
Healthcare Accessibility: Improved traffic conditions
enhance access to PMCH, crucial for emergency cases.
4.
Future-Proofing: As PMCH expands, the flyover will
accommodate increased traffic, ensuring the city's
infrastructure meets future needs.
5.

3. ASHOK RAJPATH
IMPORTANT PLACES ON
Patna Medical College and Hospital (PMCH)
Patna University
National Institute of Technology (NIT) Patna
Science College, Patna
Patna College
Gandhi Maidan

4. DUAL DECKER FLYOVER
Bihar's advanced dual-decker flyovers on Ashok Rajpath in Patna and in Chhapra are
impressive, showcasing innovative engineering to improve traffic flow and urban
connectivity, setting a new standard for infrastructure development.
A dual-decker flyover is a two-level bridge that separates local and through traffic, reducing
congestion and improving traffic flow in busy urban areas.
Ashok Rajpath Patna Dual decker flyover India’s longest Dual decker flyover in Chhapra

5. FEATURE OF
PROJECT
Salient features -
• Project cost - 422.00 crores
• Agency - BRPNNL
• Date of commencement - 15/01/2022
• Target date of completion - 15/01/2025
Physical features -
Total length of Project - 1.5km (Tier I) + 2.2km (Tier II)
Length of approach road - 422m
No. of spans - 132
Type of superstructure - PSC Girders
Elevated Bridges - 1
Average traffic movement - 2000 vehicles/hour

6. COMPONENTS INVOLVED
Component of flyover
Pile
Pile cap
Pier
Pier cap
Bearing
Girder
Slab
Pier portal frame
Pier portal cap
Components of double decker flyover

7. Different stages of project:
• Topographic survey and analysis
• Traffic survey and analysis
• Geotechnical aspects and analysis
• Planning and design
Construction of components:
• Pile
• Pile cap
• Pier
• Pier cap
• bearing
• Girder
• Slab
• Portal pier frame
• Portal pier cap
• Wearing surface
• Crash barrier
Quality control:
• Test on aggregates
• Test on cement
• Test on concrete
• Performance test

8. DIFFERENT STAGES OF PROJECT
1.Topographic survey and analysis
With help of this total space available for construction, alignment
of flyover and no. lanes of flyover & total carriageway.
2.Traffic survey and analysis
The purposes of carrying out traffic volume count are designing, improving traffic
system, planning, management
3.Geotechnical aspects and analysis
Soil sampling is done
4.Planning and design
All the results were considered and with help of Various IS Codes detailed planning and design were
prepared according to which execution is going through and the flyover is under construction.

9. CONSTRUCTION PROCEDURE & DIMENSIONS
PILE
A Pile foundation, a kind of deep foundation, can be defined as a
slender column or long cylinder made of materials such as concrete
or steel which are used to support the structure and transfer the load
at desired depth either by end bearing or skin friction.
METHODS FOR PILE CONSTRUCTIONBORING:
Boring1.
Temporary Casing2.
Cage Reinforcement3.
Concreting4.
FIGURE SHOWING RIG PILING MACHINE IS BEING USED FOR
BORING PURPOSE

10. TEMPORARY CASING IS BEING
PROVIDED FOR A PILE
CAGE REINFORCEMENT
FOR PILE
PNEUMATIC CONCRETE
BREAKERS
NOTE: THE PILE REBAR ARE BENT FOR CONNECTIVITY FOR MORE CONNECTIVITY WITH PILE CAP

11. PILE CAP
METHODS INVOLVED:
1.DEWATERING
It involves removing surface water or groundwater from a
construction site. It is done by using a sump pump
2.REINFORCEMENT
3.SHUTTERING & CONCRETING
4.CURING
A pile cap is a thick concrete slab that sits on top of piles
(deep foundation supports) to distribute the load from a
structure evenly across the piles. It ensures stability and
strength for buildings and bridges.

12. SUMP TANK
REINFORCEMENT FOR PILE CAP
DEWATERING PROCESS
To make a pile cap, first, dewater the site to keep it dry. Then, install the casing and place the
reinforcement cage. Finally, pour the concrete to form the pile cap, ensuring it encases the reinforcement
and provides a solid foundation.

13. PIER PIER CAP GIRDER
To build a pier, first, construct a strong foundation, then erect the vertical pier structure. Next, form the
pier cap by placing reinforcement and pouring concrete on top of the pier. Finally, use a launching girder
to place bridge segments or beams onto the pier caps, completing the bridge span.

14. BEARING
PORTAL PIER FRAME & PORATL PIER CAP
A portal pier frame in a dual-decker flyover is a U-shaped structure with
vertical piers connected by a horizontal beam, providing strong support
for both decks. The portal pier cap sits atop this frame, distributing
loads from the upper and lower decks evenly to the piers, ensuring
stability and strength for the entire bridge.
A bearing is a device placed between a bridge's
superstructure and substructure, allowing
controlled movement. In dual-decker flyovers,
bearings are crucial for accommodating traffic
loads, temperature changes, and seismic activity,
ensuring stability and longevity.

15. QUALITY CONTROL
Test on aggregates: -
1.CRUSHING TEST
2.IMPACT TEST
3.SHAPE TEST
4.SIEVE ANALYSIS
Test on cement:-
For quality control in construction, multiple
tests are conducted on aggregate,
cement, and concrete. Aggregate tests
include sieve analysis and moisture
content. Cement tests involve fineness,
consistency, and setting time. Concrete
tests include slump tests for workability,
compressive strength tests, and curing
checks, ensuring the materials meet
required standards for durability and
performance.
1.DATE OF PACKING
2.COLOR
3.RUBBING
4. HAND INSERTION

16. Concrete testing:-
1.COMPRESSIVE STRENGTH TEST
2.SLUMP TEST
Concrete
Grade
Targeted
Strength (MPa)
Targeted
Slump (mm)
Strength (MPa) Slump (mm)
M35
M40
M50
35
40
50
37
42
53
75-100
75-100
75-100
85
89
92

17. What we did there
We visited the dual-decker project on Ashok Rajpath, which was fascinating because it featured a type of
flyover we had never seen before. The project, managed by Gawar Construction Limited, we were
coordinated by Site Engineer Pandey Ji, who was very accommodating. He demonstrated the process of
boring with a rig boring machine for piling and explained how the pile caps, piers, and pier caps are
constructed. Unfortunately, we missed the concreting phase, as it is done exclusively at night to avoid traffic
congestion. We were also provided with detailed information about the project and visited the RMC plant,
where we conducted several quality tests.

18. What we observed
I understand that constructing a dual-decker project is far more complex than it appears.
It requires meticulous observation and coordination, especially alongside other ongoing
projects such as the Patna Metro. Overall, it was a challenging yet highly valuable
experience. Projects like this have the potential to transform the landscape of Bihar.
I’ve come to realize that building a dual-decker project is far more intricate than it
seems. It demands careful observation and coordination, particularly when dealing
with significant traffic challenges. Despite the complexities, the experience was
both demanding and rewarding.
Project like this requires precise observation and coordination, especially with heavy traffic and
stringent pollution control measures. For instance, the project faced a fine of 8 lakh for
pollution control violations. Additionally, concreting was done exclusively at night to avoid
traffic congestion. Despite these challenges, the experience was both demanding and
rewarding.
NITI

19. Everyone for your valuable time
Special thanks to
Refrences:-
BRPNNL
Gawar Construction Open AI Canva YouTube