L&t PARKCIRCUS

Project report for

K.M.D.A. PROJECT, PARK CIRCUS-ROB

FLYOVER

Prepared by RAJDIP DAS ROLL- 14ID60R04

M.TECH - Summer Internship R.C.G. SCHOOL OF INFRASTRUCTURE DESIGN AND MANAGEMENT

I.I.T. KHARAGPUR

ACKNOWLEDGMENT

Rajdip Das - Internship Project Report (L&T) 2

Mr. S.Ghosh Mr. P.Dutta

Mr. R.Rakshit Mr. H.Bhattacharya

Mr. Shankar Jha


CONTENTS Project brief............................................................................................................... 4 Pile………………………………………………………………………………………………………………………..8 Pier……………………………………………………………………………………………………………………….10 Deck Construction…………………………………………………………………………………………………13 Crash Barrier Construction………………………………………………………………………………......14 Fabrication…………………………………………………………………………………………………………….15 Heavy machineries…………………………………………………………………………………………………16 Safety…………………………………………………………………………………………………………………….17

Social responsibilities - world environment day………………………………………….....19 My internship experience ………………………………………………………………………………20

• Project taken up by KMDA in 2007 • Project started in 2010 • Construction started in 2012 • Projected date of project completion - 2015 • Total Project Cost – 86 crore • Project location – Park Circus, Kolkata

PROJECT BRIEF


Fig 1. Fig 2.

PLAN

ELEVATION


Fig 4.

Fig 3.

LENGTH OF THE SPAN BETWEEN PIERS PP104 TO C3 – 35258mm X 1 C4 TO C2 – 21954mm X 2 C2 TO P18 – 32374mm X 1 P18 TO P9 – 27500mm X 9 P9 TO P8 – 70000mm X 1 P8 TO C1 – 27500mm X 8 C1 X P87 – 30126mm X 1

NUMBER OF PILES C4 – 8 piles C3 – 6 piles C2 – 8 piles P18, P17, P16 – 8 piles each P15, P14, P13, P12, P11, P10 – 6 piles each


Fig 6.

Fig 5.

PCC SLAB

GIRDER

BEARING PEDESTAL

PIER CAP

PIER

PILE CAP

PILE

SEISMIC ARREST


Fig 7.

PILE

PLAN OF THE PILE CAP ‘C4’

Diameter of the piles – 1200mm Depth of the pile – 41metres

All dimensions are in mm


Fig 8.

PHASES OF PILE FOUNDATION CONSTRUCTION “C4”

1 4

5

3

6

2

1) Casing followed by boring.

2) Mud circulation mixing bentonite to prevent collapse of the subsiding soil.

3) Cage lowering.

4) Breaking of pile head as it contains lame concrete.

5) Shoring.

6) Reinforcement process being done for the pile cap.


Fig 10.

Fig 9.

Fig 12.

Fig 13.

Fig 14.

Fig 11.

PIER 1 3

4 2

1) REINFORCEMENT OF THE PIER

2) SHUTTERING OF THE PIER

3) REINFORCEMENT AND SHUTTERING OF THE PIER CAP

4) FINISHED PIER CONCRETE AND PIER CAP.


Fig 15. Fig 16.

Fig 17.

Fig 18.

CONSTRUCTION SEQUENCE SUB-STRUCTURE • STAGE 1 – In this stage pier is to be casted

• STAGE 2- In this stage pier cap is to be casted by providing temporary support

• STAGE 3- Total number of cables 1, 2, 3, 4, 5, 6, 7, 8. Cable number 2,4,6 & 8 are stressed to 45MPA (28 days)

• STAGE 4- PSC girders for superstructure on 7 point connector side to be casted excluding deck slab and crash barrier.

• STAGE 5 – In this stage deck slab for superstructure on 7 point connector side to be casted.

• STAGE 6 – Cables 1,3,5 & 7 are stressed to 76.5% of UTS

• STAGE 7- In this stage wearing coat and crash barrier for both spans to be casted.

PARAMETERS USED FOR DESIGN

• Coefficient of friction = 0.17/radius

• Anchorage slip = 6mm

• Concrete control Mix having 28days characteristic strength of 45N/sq.mm

• Pre-stressing steel of 15.2mm Diameter

• UTS – 260.7 Kn Yield Strength – 1860 MPA

• Area – 140 Sq M.


PIER TYPE

ECCENTRIC PIER – Used where there is space constrain due to existing condition and built forms.

CONCENTRIC PIER – Used where space is available. Centre line of the pile cap , pier , pier cap and deck slab is one single line.


Fig 20.

Fig 19.

DECK CONSTRUCTION

Precast concrete girder used between two adjacent piers. They are placed on the pedestal located on top of the pier cap.

Precast concrete slabs laid on the girder

Reinforcement over the PCC slab for the pavement

Expansion joint


Fig 22. Fig 24. Fig 23. Fig 21.

PHASE WISE CONSTRUCTION OF CRASH

BARRIER

1 2

3 4 5


Fig 27.

Fig 26.

Fig 28.

Fig 25.

Fig 29.

FABRICATION

70m span

Starting from P8 to P9

Type – Bowstring

Total weight – 354 ton (Approximate)

Parts –

• Bottom chord girder Bottom cross girder beam

• Hanger

• Bots – 8.8 Grade ( 16 mm to 24 mm diameter)

• Top Arch

• Top chord bracing

• IS2062BO Splice plate

• Bottom chord bracing

Labor type – All skilled labor

Heavy machinery used –

Crane- RT40 crane 40 ton capacity

Hydra 50 ton capacity


Fig 31.

Fig 30.

HEAVY MACHINERY USED

EXCAVATOR

RT40 CRANE used for fabrication

Hydraulic rotary drilling rig


Fig 34.

Fig 33.

Fig 32.

Life line

Tag line

LIFE-LINE – In circumstances where a guard-rail cannot be provided at the same time there is high risk of a “fall” , fall protection lifeline systems are installed as the next line of fall protection. Lifeline systems can be used to arrest workers in the event of a fall or restrain workers from reaching a fall hazard. TAG-LINE – Rope attached to the beam/truss that is being lifted. The rope is used by a worker on the ground to control the item as it swings up.


Fig 35. Fig 36.

SAFETY

SINAGES to make public aware about safety and changes in the pedestrian ways due to construction

Mesh/Net used to prevent the materials and workers from having a free fall

Barricades used assure better work environment and safety

Compulsory rule for the staffs and workers to Wear helmet at the construction site to assure safety


Fig 37. Fig 38.

Fig 39.

SOCIAL RESPONSIBILITIES - WORLD ENVIRONMENT DAY

L&T group and their employees at site are aware about the environmental degradation that is happening all around the world. So on the world environment day they undertook a unique initiative of planting numerous plants across the sites. It was great initiative, where right from the senior most site engineer to the labors, everyone took part whole heartedly. The engineers gave speech to the labors about the environmental awareness and tried to make them aware about the importance of the environment.


Fig 40. Fig 42. Fig 41.


I had a lifetime experience during my internship stint of two months at L&T. I was reporting at the park circus site where a flyover construction is being executed and presently it is at the final stage of construction and at the verge of completion. Dedicated employees and strict work ethics are the very first thing that I have observed about L&T during my internship. Quality and safety are two extremely important criterion for the organization. Timely completion of work and meeting the project deadlines set by KMDA is another parameter in which L&T is successful . When it comes to my personal knowledge gain from the internship, I consider myself extremely lucky to get such an opportunity to stay at the site. I became aware about the construction procedures, heavy machineries that are being used, how work is distributed among the subcontractors, labor policies that are untaken at the site and also the social responsibilities like plantation of new trees on the world environment day. The precautionary measures and guidelines of L&T ensuring safety of the workers and the employees at site is something that has amazed me. I would like to express my gratitude to Mr. P.Dutta Sir and MR. Ghosh Sir for giving me an opportunity to stay at the site, and last but not the least Mr. R. Rakshit Sir for helping me out at the site in all possible ways. RAJDIP DAS M.TECH, INTERN IIT KGP

My internship experience

Documents

L&t PARKCIRCUS