24pc construction works of Karnaphuli tunnel completed: Quader

[bluesky]

I think TBM in Bangladesh, they just brought it for this project. Bangladesh govt didn't purchase it.

Yes, the GoB does not won the machine. But, usually, a foreign company does not take back an expensive machine just after the completion of a project. They wait for a new project or they lease/sell out to another company that has won the contract for a similar project.

 

[Major Sam]

Yes, the GoB does not won the machine. But, usually, a foreign company does not take back an expensive machine just after the completion of a project. They wait for a new project or they lease/sell out to another company that has won the contract for a similar project.

Depends if you guys have different projects in pipeline. As its quite expensive and they did mention it to use it in South East Asia.

 

[Bilal9]

Depends if you guys have different projects in pipeline. As its quite expensive and they did mention it to use it in South East Asia.

There are many projects in the pipeline that this borer might be used in.

a. Portions of the Dhaka metro as well as
b. Some main thoroughfare lengthy underpasses in Dhaka city

are two such projects that had come up in the discussions recently.

Dhaka is far more congested and densely built-up than any other South Asian metro. Underground tunnels (properly protected from flooding of course) are a necessity even for roads passing under railroads.

Dhaka's periphery is surrounded by medium sized rivers and khals/canals (Turag, Balu, Burhiganga, Shitalakhya and their minor tributaries) that present barriers to Dhaka's expansion East and Westward.

Instead of building bridges on soft alluvial soil ((Baserock is too deep and piling has to be deep and thus expensive), building tunnels under these rivers to expand Dhaka's road network is being recently seen as more practical.

If they can build a tunnel under the English channel, there is practically no limit to this tunneling. The only limiting factor maybe cost, but that is rewarded with a much more elegant, sustainable, weatherproof and practical solution.

 

[bluesky]

Instead of building bridges on soft alluvial soil ((Baserock is too deep and piling has to be deep and thus expensive), building tunnels under these rivers to expand Dhaka's road network is being recently seen as more practical.

If they can build a tunnel under the English channel, there is practically no limit to this tunneling. The only limiting factor maybe cost, but that is rewarded with a much more elegant, sustainable, weatherproof and practical solution.

In reality, making a tunnel is many times more expensive than building bridges on the piled piers/abutments, even the deep ones. A poor country BD should not yet compare itself with London/Paris. They are rich and their people are technologically highly capable at least for the last two centuries.

So, constructing like the English Channel is too far off the mark. BD engineers are not even capable to design and build a steel truss bridge like Hardinge Bridge built by the British engineers in 1915. Big imagination has no value unless small dreams are made into practice. Now about the longest tunnel in Japan from an Internet source:

"The Seikan Tunnel (青函トンネル) or 青函隧道 Seikan Zuidō, is a 53.85 km (33.46 mi) dual gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) long portion under the seabed".

The Japanese engineers designed and built the tunnel by themselves certainly without any kind of help from the EU or US. Have the BD engineers done even any small tunneling work by themselves?