Flyover building process

myspacebardontwork said:

I've recently moved to Navi Mumbai and have been driving to Nariman Point on a daily basis via the BPT road, where MMRDA & Simplex are building the Eastern Freeway. I've been seeing the progress on a daily basis and had some questions regarding the process, if any one in the field could help me out, I'd appreciate it.

So as far as I know:
-They dig I big square hole This is the foundation.and 4 circular hole near each corner This are Piles. They are doing pile foundations.
-Shove some bars in the middle of the square and first make a 1-2 foot concrete skirting for the bars (first layer of concrete)
-Then they put up the mould around the bare steel bars and pour in some more concrete and voila the pillar is done.

Correct?

There are a whole load of pillars along the road which are stuck around the 2nd point. With the concrete skirting done, but the mould not being put. Why? Is it necessary to wait for the concrete to set Yes, after the concrete is poured, they need to wait for the concrete to gain strength. , or is it lack of funds etc? Is it possible to carry on working during the monsoons? Work can be carried all round year. I've always heard in the negative, but the way work is going on, it doesn't seem so. Bridge building is not a instant noodle. I suggest you google for words like, pile foundation, piers, pilecap, segmental bridges. Read these topics so that you get a rough idea. If you have spare time, then stop at the site when a major activity goes on, speak to a engineer, I am sure he will explain and clear your doubts.

Thanks

Have attached my brief, yet spectacular , rendition of the pillar

Click to expand...

myspacebardontwork said:

I've recently moved to Navi Mumbai and have been driving to Nariman Point on a daily basis via the BPT road, where MMRDA & Simplex are building the Eastern Freeway. I've been seeing the progress on a daily basis and had some questions regarding the process, if any one in the field could help me out, I'd appreciate it.

So as far as I know:
-They dig I big square hole This is the foundation.and 4 circular hole near each corner This are Piles. They are doing pile foundations.
-Shove some bars in the middle of the square and first make a 1-2 foot concrete skirting for the bars (first layer of concrete)
-Then they put up the mould around the bare steel bars and pour in some more concrete and voila the pillar is done.

Correct?

There are a whole load of pillars along the road which are stuck around the 2nd point. With the concrete skirting done, but the mould not being put. Why? Is it necessary to wait for the concrete to set Yes, after the concrete is poured, they need to wait for the concrete to gain strength. , or is it lack of funds etc? Is it possible to carry on working during the monsoons? Work can be carried all round year. I've always heard in the negative, but the way work is going on, it doesn't seem so. Bridge building is not a instant noodle. I suggest you google for words like, pile foundation, piers, pilecap, segmental bridges. Read these topics so that you get a rough idea. If you have spare time, then stop at the site when a major activity goes on, speak to a engineer, I am sure he will explain and clear your doubts.

Thanks

Have attached my brief, yet spectacular , rendition of the pillar

Click to expand...

sixsigma1978 said:

I know this isn't related - but I was wondering how the HECK does one go about building such a beast???

Click to expand...

engineer.akash said:

What's more interesting is whether the drive is really comfortable on each of the links?I mean were they able to manage all design parameters like gradient,banking,turning radius as per the standards? Normally space constraints makes such interchange designing one hell of a task.:nuts:

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sixsigma1978 said:

I know this isn't related - but I was wondering how the HECK does one go about building such a beast???

Click to expand...

sathya_226 said:

^^ you are not building all those structures all on a sudden... iam sure it might have built it phases.... You can expect our hebbal flyover to look much more complex than what u see today in another 25 years.....

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sixsigma1978 said:

I haven't driven on something as complex as this - closest I've seen is the Capital Beltway that surrounds Washington DC - and they've got the gradient right except for one exit that takes you to towards Baltimore Parkway - its frigging needle like narrow, the gradient feels like its a mountain slope and the exit curve is almost a U turn - its scary because you need to drop from 55 mph to 15 mph to navigate that nightmare!!

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purty_trash said:

Haha...This is such a confusing mesh that there's a good chance that you might come across yourself trying to find the correct road to pick. There's a similar structure in delhi, if you travel from Karkarduma to Indraprastha. I'll check Google earth to see how the aerial shot of that baby looks like.

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sixsigma1978 said:

I know this isn't related - but I was wondering how the HECK does one go about building such a beast???

Click to expand...

This concept stock photo uses an aerial view of a freeway interchange to illustrate concepts including connection, transportation, complexity, networking and challenge. The base photograph was taken from a helicopter over Oakland, California. The image was composited with Photoshop. I spent over two days painstakingly selecting sections of roadway, then copying pasting sizing and rotating the pieces to fit together an ever more complex puzzle. I also had to copy, paste and position each vehicle, car and truck, and then create appropriate shadows. I believe this complicated maze of on ramps, off ramps and merging roads is a great metaphor for many of today's important issues ranging from the Internet and world wide web, to social media, to communications and connections. Another topic that this picture is well suited to represent is bandwidth and the ensuing issues. These road ways can illustrate neuron pathways, fiber optics, copper wire and social networks. This must be the most complex freeway interchange ever created...though it was created as a new photographic reality and not a real one in the sense of concrete and steel. I have another similar image that takes this one a step further, one in which the earth has been essentially paved over with freeways and roads. Such an image takes the freeway symbology and metaphor in a whole different direction; environmental issues, global custodianship, and mother earth and home planet ecology issues. Heck, these images are just plane fun to look at as well! This cloverleaf can be used to illustrate issues dealing with infrastructure, transportation issues, new road building and construction techniques, and maintenance and repair of roadways. This picture has everything form overpasses and underpasses to merging traffic and freeway signage.

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