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Showing posts with label Tunnelling works. Show all posts
Showing posts with label Tunnelling works. Show all posts

Wednesday, 23 October 2019

08:12

Kolkata East West Metro Line2 Connection to Sector V with Salt Lake Stadium Delayed

Kolkata East West Metro Line2 Connection to Sector V with Salt Lake Stadium Delayed
The scheduled start of commercial operation on the first 5.7km stretch of Kolkata’s East West metro Line 2 connecting Sector V with Salt Lake Stadium has again been delayed.
KOLKATA: Prime Minister Mr Narendra Modi, was reportedly scheduled to inaugurate the first phase of the East West corridor on October 24. However, this has been cancelled following objections by the Commissioner of Rail Safety (CRS) on passenger safety, a senior Ministry of Railways official said.
After an earlier inspection on the first leg of the section in July, CRS flagged concerns on the “defective bearings” on the piers, while instructing the authorities to undertake a software upgrade on the train control and management system. Official’s claims about the issues having been fixed were belied following a second CRS survey that was completed on Thursday. “The CRS report is in the process of getting prepared. As of now, there are no plans to start commercial operations on the stretch,” a Ministry of Railways official said.
Major uncertainties persist on whether work will restart on the unfinished 10.8km underground section of the line. Construction of the unfinished section of the line was halted in August following the collapse of approximately 100 old buildings in central Kolkata’s Bowbazar area after the earth caved in during tunnelling work in the neighbourhood, forcing residents to evacuate.
Indian Railways (IR), the implementing agency, has solicited international tunnelling experts including Mr Paul Vireli of South Africa, Mr Guy Bridges from Hong Kong and geotechnical engineer Mr John Endocott from Singapore.
The East West line, originally slated to open in 2012, is designed to connect the twin cities of Kolkata and Howrah. Of the 16.6km, 5.8km will be elevated and 10.8km will run underground. Twin 520m-long tunnels under the Hooghly River are planned as part of the underground section.
With a project cost of Rs 48.7bn ($US 684.5m) the East West Line was originally conceived as a 14.67km line. After a major realignment in 2016, the length was increased to 16.55km. Following delays including foreign currency losses, project cost have increased approximately 80% to nearly Rs 90bn.
The 27.22km Line 1 from Noapara to Kavi Subhash is currently Kolkata’s only operational metro line, while three new lines are in various stages of construction.
Source:RailNews
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Friday, 6 September 2019

06:56

Kolkata First Underwater Metro In Trouble

Kolkata First Underwater Metro In Trouble

"It felt like an earthquake. House number 13 started collapsing. Its pillars broke one after the other till it was leaning forward. That was on Saturday. Now many others have also been affected," Sourav Datta, a local resident, said.

Courtesy:NDTV

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Sunday, 14 July 2019

22:23

Longest Electrified Tunnel between Cherlapalli-Rapuru section

Longest Electrified Tunnel between Cherlapalli-Rapuru section
On the newly commissioned line, the travel time gets reduced to about 5 hours!
SECUNDERABAD: South Central Railway has commissioned the longest electrified tunnel, measuring 6.6 Kms between Cherlapalli and Rapuru stations and is part of the recently completed Obulavaripalli – Venkatachalam new railway line.
The tunnel has been completed in a record time of 43 months.
Two freight trains have successfully run on 25th June, 2019 marking the full-scale Operation of the newly built electrified railway line between the two stations, thereby opening up viable rail connectivity between Krishnapatnam Port and its hinterland for Goods train services, South Central Railway (SCR) said in a statement.
Completion of this tunnel has enabled Railways to start freight operations on this important railway line, which has reduced the distance between Krishnapatnam Port and hinterland areas by 60 kms. At present, the average travel time taken by goods train from Krishnapatnam Port to Obulavaripalli is 10 hrs. On the newly commissioned line, the travel time gets reduced to about 5 hours, which will result in a saving of travel time by 5 hours, it added.
The construction of this tunnel paved the way to operate freight trains in Obulavaripalli – Venkatachalam – Krishnapatnam Port new railway line for a distance of 113 Kms. The section is now notified for commercial freight operations as well.
Salient Features of Tunnel
Located between Cherlopalli to Rapuru stations and constructed in shape of ‘Horse Shoe’.
New Australian Tunneling Method(NATM) is used and the cost incurred is Rs.460 crores
Length of the tunnel is 6, 660 mts and is in straight alignment.
The height of tunnel (rail level to roof) is 6.5 meters and the minimum height of contact wire is maintained at 5.2 meters.
Ballast less Track is constructed with Bi-block sleepers and Vaslo fittings
Full length lining is provided with 300 mm thickness
Two nos. of traction power supply substations are provided near Cherlopalli and near Adurupalli with necessary switching stations in between.
OHE maintenance depot is provided at Rapuru along with tower-car shed.
LED lighting provided at 10 m intervals inside the tunnel
Conventional OHE has been provided with a maximum span of 36 m and maximum tension length of 1206 m. Brackets for supporting OHE have been fixed on wall mounted type plate fittings, which are fixed to the tunnel lining concrete.
Spring type Auto Tensioning Device (ATD) of South Korean make is adopted in place of conventional type ATD for maintaining necessary tension in OHE wires, for the first time in SCR.
Fail safe earthing arrangements are provided for safety of personnel working in tunnel.
This longest electrified tunnel is pivotal in the new railway line between Venkatachalam and Obulavaripalli and is a game changer in the freight operations of the zone.
This new line facilitates direct & viable connectivity between South Coast and West Coast and enhances the freight basket of South Central Railway.
Gajanan Mallya, General Manager, SCR said that it is a matter of pride for the zone to have such remarkable structure. The newly constructed railway line is also helpful for decongestion of traffic on Vijayawada – Gudur Main line.

Source:RailNews
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Tuesday, 11 April 2017

09:11

CMRL:Underground Metro all set to roll

CMRL:Underground Metro all set to roll

Thirumangalam-Nehru Park stretch likely to be opened by end of next week

The first underground stretch of Chennai Metro Rail is likely to be opened by the end of next week, reliable sources said.
As the model code of conduct is in effect for the byelection in the R.K. Nagar constituency, it is not clear if Chennai Metro Rail Limited (CMRL) has sought an exemption from the Election Commission to inaugurate the stretch.

CMRS inspection

The underground stretch from Thirumangalam to Nehru Park, a distance of about 8 km, first needs a mandatory safety clearance from the Commissioner of Metro Rail Safety.

The inspection is likely to happen in a few days, official sources said. Soon after they get the certification from CMRS, the stretch can be thrown open, subject to approval from the State for the inauguration. The stretch has received safety clearances from various other agencies in the past few weeks.

The construction of this stretch has been on since 2012, when the first tunnel boring machine (TBM) was deployed underneath Nehru Park.

Over the last five years, tunnelling, laying of tracks and the construction of stations were completed on this stretch.

The first service of Chennai Metro Rail — an elevated stretch from Koyambedu to Alandur — was opened in June 2015. Seven months ago, the second one from Little Mount to Chennai airport, also an elevated stretch, became operational.

At present, the fares of Chennai Metro Rail range from ₹ 10-50 for general passengers. If the underground stretch is opened, the maximum fare is likely to go up to ₹ 60.

Source:The Hindu
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Tuesday, 8 September 2015

07:29

Kolkata’s East-West Metro tunneling to start from Howrah in Sept

Kolkata’s East-West Metro tunneling to start from Howrah in Sept

Kolkata: Metro Railway will make an all-out effort to resolve issues that have affected the construction of the East-West corridor from the Howrah Maidan end. This was indicated by Metro Railway general manager A K Kapoor, who inspected the stretch from Howrah Maidan to Salt Lake Sector-V on Thursday and spoke to various stakeholders of the project.

Kapoor is also the chairman of Kolkata Metro Rail Corporation Limited (KMRCL), which is in charge of the E-W corridor. Work at the Howrah-end is likely to start before railway minister Suresh Prabhu’s next visit to Kolkata in the third week of September.

“At present, no work is going on at the Howrah end as a court case is pending on the matter. During his last visit to Kolkata, Prabhu met chief minister Mamata Banerjee and was assured of all assistance. With help from state government, the issues holding up work at Howrah will be resolved soon. A tunnel-boring machine will then be lowered at Howrah Maidan. The GM instructed all officials to ensure that deadlines are met,” said a senior official.

During his last visit to Kolkata in August, Prabhu had said that the first phase of the E-W corridor, which stretches from Salt Lake Sector-V to Mahakaran, will be completed by June, 2018. During his next visit, the minister is likely to announce commencement of work on the technical portion, including laying of ballast-less tracks and signaling systems. If the June, 2018, deadline is to be met, officials will also have to expedite work on the stretch between Sealdah and Mahakaran via Esplanade.

The original alignment of the E-W Metro link was via CR Avenue and Brabourne Road. But, the new alignment will pass through Esplanade and Mahakaran before going under the Hooghly towards Howrah Maidan. The railways ministry was initially reluctant to bear the additional costs for the changes in alignment. But after much confusion and a prod by Calcutta high court, the ministry relented.
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Wednesday, 15 July 2015

12:09

Chennai Metro rail fires Gammon, stops tunnelling work

Chennai Metro rail fires Gammon, stops tunnelling work

Chennai (MAS): Underground tunnelling of metro rail along Anna Salai here has halted and is likely to remain so for several months as Chennai Metro Rail has terminated the 2,000crore contract with Gammon India-Mosmetrostroy.

The decision was taken after Gammon India delayed work and couldn’t get its Russian partner Mosmetrostroy to resume work on the last 3km stretch.

This would mean that the metro corridor, which is one year behind schedule and struggling to meet an extended deadline of 2016-end, may not be ready till late 2017. This 23.1km corridor, from Washermenpet to Airport, includes 14.3km underground.

Authorities are planning to float fresh tenders for the remaining work worth 800crore. The process is expected to take three or four months. If everything goes according to Plan B, work is likely to resume in January.

The Gammon-Mosmetrostroy joint venture had bagged contracts to build tunnels and underground stations between Government Estate to Saidapet in February 2011. It could complete only 60% of the work.
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Friday, 3 April 2015

19:57

Konkan Railway plans to set up India’s best Tunnel Technology Institute at Goa

Mumbai: Konkan Railway has made big plans to celebrate 25 years since some of the best engineers in the country constructed the 741 kilometre line — possibly the biggest railway endeavour since Independence — in 1990. The most ambitious part of the 25-year tribute is to build a state-of-the-art Tunneling Technology Institute at Goa, an apt gift from a rail line which has 91 tunnels — totaling 84 kilometres — on its route.

KR has also completed around 22 km of tunnels in Jammu & Kashmir as part of the Udhampur-Srinagar-Baramulla project. KR in the years past has worked on the tunneling and ventilation of the Mumbai-Pune Expressway as well as a water tunnel in Amdhra Pradesh for irrgation.

B.P.Tayal, Chairman & Managing Director of KR, said, “It will be a true gift from KR to the nation. At the moment there are no institutes in the country that are teaching advanced tunneling technology and we have to depend on foreign experts. At the same time, the demand for tunneling in railways, especially in Jammu & Kashmir and the north-east, in hydro-electric power projects, underground metro lines and even highways like the one coming up in Kashmir, will be immense. So, having a state-of-the-art institute will help the country is a big way.”

Money set aside for the preliminary activities that will go into the creation of the institute is in the range of Rs5 crore, said officials.

Apart from the tunnel technology institute, more than 50 activities have been lined up over the next few months, said officials. A section of officials are hoping that the 25-year celebrations — that too under a railway minister who hails from the Konkan — will see the ministry granting sanction for the long overdue electrification and track doubling plans for the railway line.

A KR proposal to electrify its 741-km route between Roha and Thokur at a cost of Rs720 crore was cleared by Prabhu on November 23 last year. A Rs.1,500 crore doubling survey was approved by the KR board of directors on October 29 last year and it was been sent to the railway board.



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Wednesday, 6 August 2014

20:49

DMRC completes work of 2 parallel tunnels simultaneously

DMRC completes work of 2 parallel tunnels simultaneously

New Delhi:  For the first time in the country, the construction work of two parallel tunnels were completed together at Dabri Mor, on the Janakpuri West to Botanical Garden corridor of Phase III, a DMRC spokesperson said today.

“Two Tunnel Boring Machines (TBMs) named ‘Riddhi’ and ‘Siddhi’ emerged out at the Dabri Mor station after boring 1.2 kilometre long twin tunnels.

“While one of the TBMs was inserted in December last year, the other TBM had started work in January earlier this year,” Anuj Dayal, Corporate Communications Executive Director, said, adding, these are the first tunnels to be completed on this corridor.

The tunnels have been constructed at a depth of 16.5 metres and the internal diameter of the tunnels is 5.8 metres.
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