What's new

Karnaphuli tunnel to be ready for traffic by 2022

Black_cats

SENIOR MEMBER
Dec 31, 2010
7,020
-5
10,300
Karnaphuli tunnel to be ready for traffic by 2022



DHAKA, Jan 18, 2021 (BSS) – The 3.32-kilometre long tunnel under the Karnaphuli River is expected to be ready for vehicular movements
by 2022.

“The overall progress of Karnaphuli Tunnel reaches 62 percent and the financial progress rose to 56.80 percent. Once completed, the
tunnel will be a part of Asian Highway,” Project Director (PD) Engineer Harunur Rashid Chowdhury told BSS here today.

He said the total length of the proposed first ever four-lane Bangabandhu Sheikh Mujibur Rahman tunnel will be around 9.39 kilometres, including 3.32 kilometres of the main tunnel, adding that the total length of the approach road between western and eastern side
will be 5.35 kilometres alongside 727 metres of over bridge (Viaduct).

The project director said the length of tunnel tube will be 2.45-km, while 10.80 diametres inside the tube is fixed and vertical
clearance inside the tunnel is 4.90 metres.

According to the project details, 104 metres boring of the second tunnel tube has been completed so far till yesterday, while
construction work of all 19,616 segments were completed in Zhenjiang city of Jiangsu province in China on December 31, 2020.

Besides, experts were making the segments rejected earlier there and 15,784 segments were brought in Chattogram site and 9,784 and 416
segments were installed in the under construction first tunnel and second tube respectively, it said.

Construction work of substructure for 727 meters viaduct was finished and superstructure work of 142 pre-febricated box girders out
of 203 was ended.

Meanwhile, 115 pre-febricated box girders were installed in between 1-13 spans. Harun-ur-Rashid hoped that the installations of rings in these tubes will be finished by next May or June, if weather remains favorable and no natural calamity takes place.

The two tubes comprised of four lanes and each tube measures 35 feet wide and 16 feet high. After completion of the project, it will greatly improve the traffic conditions in Chattogram and promote economic development of the country.
Earlier, Prime Minister Sheikh Hasina and President of China Xi Jinping laid foundation stone of the tunnel on October 14, 2017.

Later, Prime Minister Sheikh Hasina inaugurated the boring work of the tunnel on February 24, 2019.

The estimated cost of the tunnel is Taka 10,374.42 crores, where Chinese Exim Bank will provide 5,913.19 crores.

The Chinese firm, China Communication Construction Company Ltd (CCCC), was appointed as consultant for construction of the tunnel.

The tunnel will connect Chattogram Port and Anowara Upazila and is expected to make communication between Chittagong and Cox’s Bazar easier with reducing traffic congestion on two bridges over the Karnaphuli River.
 

Dark1

BANNED
Feb 29, 2020
1,648
-29
1,118
Country
India
Location
India
Interesting and congrats.
The photo of the tunnel is obviously wrong as its a metro tunnel being shown.
While I understand this will be a road transport tunnel with box girders.
In my knowledge this will be the first tunnel of this length in the subcontinent purely for traffic congestion elimination purpose.
India has a few tunnels of more length but all in mountainous regions.
Two points stand out ,
Work started in 2017 and will be completed in less than 5 years , if all goes to plan.
And why import prefabricated boxes and segments from china ? Its a low technology item, fabricate ir cast inhouse in Bangladesh.
 

Bilal9

ELITE MEMBER
Feb 4, 2014
15,707
1
24,587
Country
Bangladesh
Location
United States
Interesting and congrats.
The photo of the tunnel is obviously wrong as its a metro tunnel being shown.
While I understand this will be a road transport tunnel with box girders.
In my knowledge this will be the first tunnel of this length in the subcontinent purely for traffic congestion elimination purpose.
India has a few tunnels of more length but all in mountainous regions.
Two points stand out ,
Work started in 2017 and will be completed in less than 5 years , if all goes to plan.
And why import prefabricated boxes and segments from china ? Its a low technology item, fabricate ir cast inhouse in Bangladesh.
Karnaphuli River tunnel introduces many firsts in Bangladesh –

  • The first underwater tunnel in Bangladesh.
  • Twin 2.5-kilometre, 11-meter diameter tunnel under the Karnaphuli River - probably a first in the subcontinent
  • US$705 million Karnaphuli Tunnel Project is one of the many mega projects currently underway
  • Tunnel Boring Machine (TBM) at 11m dia is probably one of the largest ever made. Certainly one of the largest made by that TBM fabricator in China.
  • The pre-cast concrete tunnel lining segments (partially circular cross section) are made in China and shipped to Bangladesh - because they employ specialized high tensile pre-tensioned rods before RCC casting of lining segments occur. There will be 20,000 twelve tonne segments. This was the arrangement made with the contractor and designers for meeting the deadline. I don't agree that these are simply RCC cement slabs.
More details here,

 
Last edited:

Bilal9

ELITE MEMBER
Feb 4, 2014
15,707
1
24,587
Country
Bangladesh
Location
United States
The photo of the tunnel is obviously wrong as its a metro tunnel being shown.
No - those are not rail/metro-track lines on the ground. They are utility lines (power, fiber optics, gas etc.)

The roadway is going to be built on top of these utility lines by laying sectional concrete slabs.
 

Dark1

BANNED
Feb 29, 2020
1,648
-29
1,118
Country
India
Location
India
No - those are not rail/metro-track lines on the ground. They are utility lines (power, fiber optics, gas etc.)

The roadway is going to be built on top of these utility lines by laying sectional concrete slabs.
You are right. Its a separate tunnel for utilities. Non transport.
 

Users Who Are Viewing This Thread (Total: 1, Members: 0, Guests: 1)


Top Bottom