00:00 We surveyed the water and rock deposits in Mumbai's Bhoogarbat before.
00:06 The heritage of South Mumbai dates back to 100-150 years.
00:10 We didn't cover even a small area. We dug a well to put the machine underground.
00:19 We assembled the parts and started working under the ground.
00:23 We studied the water levels in different places and took it to the next level.
00:30 Hello, I am Vinayak Parabh and I am here with the second episode of Ghost Mumbai.
00:50 In this second episode, we explored the ancient Mumbai.
00:55 We also explored the modern Mumbai.
01:00 I have used the word 'modern' a lot.
01:02 'Atyadhunik Mumbai' means 'Ati-Adhunik Mumbai'.
01:06 The metro that is being built in Mumbai is the most modern Mumbai.
01:15 The metro that runs from Mumbai's Bhoogarbat.
01:18 The metro is a new building in Mumbai.
01:22 We will explore the metro in Mumbai.
01:28 We will find out the importance of the metro.
01:32 The Mumbaians might have some doubts.
01:36 We will find out the answers to all these questions.
01:41 [Music]
01:51 [Music]
02:17 We have with us the MMRCL's Executive Director, Civil Charuhas Jadhav.
02:33 Jadhav Sir will explain the importance of the metro.
02:37 Jadhav Sir, we would like to know the meaning of the metro.
02:45 The metro is 33.5 km long and is a completely built metro.
02:55 You might know that Mumbai is made up of 7 cities.
02:59 We have built a complete landmass by connecting the cities.
03:05 We surveyed the city to find out where to build a new metro.
03:19 We dug a borehole every 250 m.
03:23 We fixed the alignment.
03:27 This was a big challenge.
03:31 The city is limited in number of places.
03:35 There are many old buildings and heritage buildings.
03:39 All these components were aligned.
03:45 We shifted the old buildings and built permanent houses.
03:49 We took care of the old buildings and built a metro line.
03:53 There are 100-150 years old heritage buildings in South Mumbai.
04:01 We did not cover a small part of the heritage buildings.
04:05 We built towers to take the road from the borehole.
04:09 We built a tunnel under the towers.
04:11 These were all the challenges.
04:13 The biggest challenge we faced was the R.A. colony.
04:17 Mumbai is aware of this.
04:21 We fought court cases for 5 years.
04:25 Then we started this work.
04:27 We faced these challenges in Mumbai Metro Line 3.
04:33 We have reached this stage now.
04:37 The last 2 years have been spent in the corona pandemic.
04:43 How much impact has it had?
04:45 When the lockdown started, the country was closed.
04:50 The first 20-25 days, there was no work.
04:54 Then the government started to give facilities.
05:00 5% people can come.
05:02 10% people from the government sector can come.
05:04 People from the emergency services should come.
05:08 We took advantage of this and started the work of the metro again.
05:13 There were other challenges. Interstate services were shut down.
05:20 People were stuck in the villages.
05:24 We faced this for a year.
05:29 It took a long time to regularize.
05:34 You mentioned an important thing in the different obstacles and challenges.
05:41 Geological challenges.
05:46 Hard rock is different in some places.
05:48 We have heard that the metro has used technology in a good way.
05:55 For example, the tunnel boring machine.
06:00 We used it.
06:02 At the same time, work was started in 15-17 places.
06:07 How does the tunnel boring machine know which way to go?
06:14 Suppose it goes to the side, it will be a mess.
06:17 Tell us about the technology used in this.
06:24 That's a good question.
06:26 When we make alignment in the tunnel boring machine,
06:29 we do not make a simple alignment.
06:33 We have to make different types of turns.
06:37 We have to make it from the right side.
06:39 While doing that, we have GPS coordinates.
06:41 According to the Global Positioning System,
06:43 we are standing here.
06:45 There is a unique coordinate of this point.
06:48 That is why we had fixed all these coordinates.
06:52 When we started the tunnel boring machine and started the alignment,
06:58 there is a laser beam that guides it.
07:01 Using that laser beam, we have taken care of the alignment.
07:09 It has been done that the technology is used in such a way
07:14 that it goes to the next side and the lining is done from the back.
07:18 How did it happen? Tell us about it.
07:20 Tunnel boring machine has a main part called cutter head.
07:27 You said that it is the actual cutter.
07:29 Yes.
07:30 There are various components of the tunnel boring machine
07:34 from 80 to 100 meters behind it.
07:37 One of the components is that the lining that you see here,
07:43 it is divided into 6 parts.
07:47 We cast it outside in the casting yard.
07:50 After that, it is brought inside.
07:53 As the tunnel boring machine moves forward,
07:56 there is a machine in it to make the lining stand.
08:00 This lining is 1.4 meters long.
08:04 If the tunnel moves forward by 1.4 meters,
08:07 the lining is made to stand.
08:09 So, both work at the same time.
08:11 Yes.
08:12 It also provides safety.
08:14 If we go ahead and the back part falls,
08:16 it does not happen.
08:18 That is why the lining is supported.
08:20 So, time is saved.
08:22 Yes.
08:23 You said that at one time,
08:26 17 tunnel boring machines were operating.
08:28 How did you coordinate this?
08:30 Because only if they are coordinated properly,
08:33 they can be moved from one place to another.
08:37 Correct.
08:38 We had a project of 33 kilometers.
08:41 We had divided it into 7 parts.
08:43 We had made 7 packages.
08:45 In each package, there were 2, 3, 6 machines.
08:51 We had divided the machines in different places.
08:57 We had dug a big well to put the machines in the ground.
09:05 We assembled each part and started working under the ground.
09:11 Okay.
09:12 If you look at the two packages here,
09:15 Package 7 and Package 6,
09:17 the machines here went out from the station of Package 6.
09:22 Okay.
09:23 So, we had coordinated it like this.
09:27 Okay.
09:28 In the minds of the people of Mumbai,
09:30 after the storm, there was a question.
09:33 After the storm, there was water everywhere in Mumbai.
09:37 At that time, the people of Mumbai started discussing on social media
09:40 that there is so much water above,
09:42 the metro will go from below,
09:43 what to do if there is water there?
09:45 So, in that context, I feel that the people of Mumbai
09:48 have to do the discussion of this problem
09:50 as an MMRCL official.
09:53 Definitely.
09:54 I would be proud to say that
09:56 even after so much rain,
09:58 there is no water in the Mumbai Metro Line 3,
10:00 tunnel or station.
10:05 This means that the work has been done very well.
10:08 The work has been done very well
10:09 because we had planned the study for it.
10:13 Now, we have studied the water level in different places
10:16 on the roads of Mumbai
10:19 and taken the plinth level above that level.
10:23 Okay.
10:24 That is, every place is about 4.5 to 5 feet above the plinth
10:29 from the road,
10:30 that is, the entry level.
10:32 Okay.
10:33 The second, the hole dug by the station,
10:37 on all four sides,
10:39 polyurethane sheets have been applied
10:43 and water proofing has been done.
10:45 Okay.
10:46 Similarly, in the tunnel,
10:48 as we said earlier,
10:49 the concrete lining has been applied.
10:51 Correct.
10:52 After applying the concrete lining,
10:54 the cementitious ground has been filled
10:57 in the place between it and the natural rock.
11:00 Okay.
11:01 So, the water will not flow from inside.
11:03 Similarly, in between the two joints,
11:05 in between the two concrete linings,
11:07 a hydrophobic rubber gasket has been applied.
11:10 Okay.
11:11 That is, when water is applied to it, it will swell
11:13 and water will not flow inside.
11:14 Friends, in this entire section,
11:17 we just had a conversation with Charuhas Jadhav.
11:20 And we must have noticed
11:22 how big obstacles and how big obstacles
11:25 were on the way of Metro 3.
11:28 And on that, in a very good way,
11:30 using the modern technology,
11:32 using technology,
11:33 they have been able to overcome it in a very good way.
11:36 The most important question
11:38 that was in the minds of the Mumbaikars
11:39 in this rainy season,
11:40 I think you all must have got a very good answer to it.
11:45 Charuhas Jadhav told us
11:47 how good technology has been used.
11:49 Not one, not two,
11:50 but four to five different layers have been used.
11:53 Because of that, in this Metro of Mumbai,
11:55 water that can be seen in a bucket will not flow.
11:58 In the context of Mumbai Metro,
12:00 more and more important,
12:02 interesting, different things
12:05 we will understand in the next section.
12:08 Till then, keep watching Lok Satta Live YouTube channel.
12:11 Watch, share and don't forget to like.
12:15 [Music]
Comments