A

Practical Training Presentation

ON

“ JAIPUR METRO CONSTRUCTION OF PHASE 1B ”

Submitted In Practical Fulfillment For The Award of Bachelor Of Technology In

CIVIL ENGINEERING

2013-2017

Submitted To: Submitted By:

Dr. Sanjay Gaur Vishal Prasad Jaiswal

(HOD) (13EMACE094)

MAHARISHI ARVIND COLLEGE OF ENGINEERING & RESEARCH CENTRE

SIRSI ROAD, JAIPUR

RAJASTHAN

CONTANTS

INTRODUCTION

SAFETY

UNDERGROUND STATION

CUT & COVER METHOD

DIAPHRAGM WALL

CONCOURSE SLAB Reinforcement

PLUNGE COLUMN

SEGMENT

CONSTRUCTION WORK OF TUNNEL BY TBM

INTRODUCTION

Jaipur Metro Rail Corporation Ltd. (JMRC) is a state

owned company that operates the Jaipur metro project.

JMRC is a client in the project of Jaipur metro and

Continental Engineering Corporation (CEC) is the

contractor.

Apart from these two major companies Delhi Metro Rail

Corporation Ltd.(DMRC) Is also serving a major role as

consultant in the Jaipur metro project.

DMRC is a state-central owned company, it is also

involved in the planning and implementation of metro

rail, monorail and high – speed rail projects in India and

abroad.

DMRC has a business development which is in charge of

the consultancy services.

The Jaipur Metro Rail Project are divided into two phases.

PHASE 1 PHASE 2

EAST-WEST CORRIDOR NORTH-SOUTH CORRIDOR

PHASE 1-A (FROM MANSAROVAR TO AMBABARI TO SITAPURA

CHANDPOLE )

PHASE 1-B (FROM CHANDPOLE TO

BADI CHAUPAR)

PROJECT DETAILS

PROJECT NAME:-

Design and construction of tunnel between chandpole and badi

chaupar and underground station by cut and cover method of

phase 1-B.

Project length:- 2789m (approximately)

Construction Methodology:-

Bored Tunnel by Tunnel Boring Machine(TBM)

Underground Station:- Top – Bottom Method

Project Cost (Phase-1B):- Rs. 1126 Crore (Approximately)

SAFETY

Safety plays a very important role on the

site, because it helps in protecting

against, physical, damage, harm,

accidents or any other event which could

be considered non-desirable.

So, safety is the first priority should be

given, while going to the site where

construction work is going on

In the site safety are done with the help

of PERSONAL PROTECTIVE

EQUIPMENT(PPE)

UNDERGROUND STATION

Underground Stations have been proposed as cut and

cover with top-bottom construction method.

Before starting cut and cover method following process

should be implemented.

> All the utilities ( water line, sewage line, electricity line,

telephone line, etc.) located in the area where excavation

works are to be executed should be removed.

> All the traffic should be diverted to suitable alternate

route.

1m

5.55m

0.7m

5.15m

0.7m

7.76m

1m

The underground station is

divided into four slabs

namely, top slab, roof slab,

concourse slab and base slab.

The portion between top slab

and roof slab is kept for

utilities, portion between

roof slab and concourse slab

is kept for ticketing counter

and the portion between

concourse slab and base slab

is for platform.

TOP SLAB

ROOF SLAB

CONCOURSE

SLAB

BASE SLAB

CONSTRUCTION SEQUENCE

SITE PREPARETION

Before the setting up of cranes site should

be cleaned and compacted at the places

where cranes are going to be placed.

It is suggested that pressure water pipelines

crossing the proposed cut area are provided

with valves on both the sides of the cut and

so that if any leakage to the pipeline to

avoid flooding of the cut/damage to the

work.

> Earth Works

Earth works are engineering works created

through the moving or processing of parts

of the earth’s surface involving quantities

of soil or unformed rock.

EARTH WORK OF TOP SLAB AND ROOF SLAB.

CUT AND COVER METHOD

We call these as a cut and cover method because as the

structure is completed upon there, then they are

backfilled and they finally become underground.

The cut & cover method is cost effective and more

simple, safe and easy to control.

There are two process in these method, they are;

1) TOP – BOTTOM

2) BOTTOM – TOP

Top – Bottom construction is commonly used in congested

areas.

DIAPHRAGM WALL (D-WALL)

D-WALL is a structural

element that transmits

lateral load to the

vertical resisting

elements of a structures.

There are three steps for

constructing the D-Wall.

1. Excavation of D-Wall

2. Placing of

reinforcement Cage

3. Concreting.

EXCAVATION OF D-WALL

The excavation is carried out by using

grabbing machine.

The grabbing machine is placed on the

guide wall.

Using the grab, excavated materials are

loaded on trucks and removed out from

site.

PLACING OF

REINFORCEMENT

Steel Reinforcement (Rebar) cage

is fabricated in segments on the

site and the couplers are covered

by thermo col and than delivered

by crane into the panel and

lowered down into the trench.

Couplers are left and pre decided

height where they have to

connect with the main bars of

slab.

CONCRETING

Depth of D-Wall is around 29m so as the

depth is very high so direct concreting

can not be done as the chances of

segregation become high.

Concreting of the D-Wall panels is done

by concrete tremieing.

With the tremies, concreting of a D-Wall

starts from the bottom and the tremies

are lifted progressively as the concrete

level rises.

CONCOURSE Slab

Reinforcement

The thickness of concourse slab is

700mm and a cover block of 50mm is

provided at the bottom.

The Top surface of the slab is in

tension so more reinforcement is

provided on the top surface( 32mm

main bar) comparatively less

reinforcement is provided (20mm

main bar) on the bottom surface.

Couplers

Couplers are provided to connect with

main bars of slab.

Couplers are provided at every

slab(top, roof, concourse and base)

and generally the length of the

couplers are 65mm (in case if main

bar is of 32mm dia) and 41mm ( in

case if main bar is of 20mm).

Couplers are also provided in the slab

for the permanent columns and load

bearing wall.

In case if coupler is missing or going out of position then

holes are drilled and re-bars are placed using grouting.

The strength of the grouted re-bars is tested by pull out

test.

1. First of all a hole is drilled at the point where grouting will

be done.

2. After that bar with chemical grout is placed in that hole.

3. After 24 hours avg. load is applied on that bar and it is

ensured that the bar is not displaced from its position.

4. For 32mm dia. Main bar hole is drilled up to 500mm and

dia. of driller is 400mm and it should not displaced up to 25.2

ton load.

6. For 20mm dia. Main bar hole is drilled up to 300mm and

dia. Of driller is 25mm and it should not displaced up to 13.2

ton load.

PLUNGES COLUMN

Plunge column are the

temporary structures

which provide the initial

support to the slab.

Before construction of

permanent column, all

the loads are beared by

the plunges column.

Segment

Segment are used for ring of

tunnel lining.

The segment consist of six parts

namely they are;

T1,T2,T3,T4,T5 and the small

part is called key ring.

The width of the each segment is

1.2m and thickness is 270mm

Manufacturing process

of segment

The segment are

prepared on the mold

and the concrete grade

is used was M35.

Concrete are vibrated

by the vibrator fitted

under the molds.

Curing of segment are

done with help of steam

curing.

Steam curing are done

for 4hrs at 60-70 c.

Segment are taken out

from the mold by gantry

crane and crack are

measured at the

surface.

Tunnel Construction by

TBM

Tunnel excavation are done mostly by

TUNNEL BORING MACHINE(TBM).

On soil investigation the type of soil

obtained was soft soil and hence the type

of TBM Used is EARTH PRESSURE BALANCE

TUNNEL BORING MACHINE(EPBTBM).

The length of the TBM is 85m after

assemble.

The cutting wheel will typically rotate at

1.5 rpm, cutting the soil face into

excavating soil.

TUNNEL LINING

SEGMENT

A 100mm space is left between the

segment and the ground surface

radially, this space is for the grouting

of the tunnel surface to fix the

segment with ground surface.

Grouting plant is set up on the site.

Grouting can be done by two ways,

firstly by manually by the nozzles

fitted to the grout pipe.

Or grout is supplied to the TBM and

the TBM itself do the grouting.

TRANSPORTATION OF

MUCK BY RAILWAYGANETRY CRANE ARE

USED TO CARRY OUT

THE MUCK

SEGMENT NUMBER SURVEY POINTS