Achieving landmarks with technology
Technology

Achieving landmarks with technology

Afcons Infrastructure Ltd has been on the Metro construction landscape since it was first introduced in India, with Kolkata Metro commencing operations in 1984. Subsequently, for Delhi Metro, the Shapoorji Pallonji Group company secured an elevated Metro package in 2000 and completed the 4.5-km construction in 2003. Since then, it has completed over 42 kms of elevated Metro construction, underground station construction and aero-city alignment in the national capital. 
At present, Afcons is building Metro rail infrastructure in Kolkata, Ahmedabad, Nagpur and Chennai. “We have constructed over 100 kms of Metro rail, and more than 30 elevated and underground stations in five Indian cities,” says R Anantakumar, Executive Vice President, and BU Head, Urban Infrastructure, Afcons, as he shares the company’s key achievements in the segment...

Success of Metro rail projects in India
In India, Metro Rail Transit System (MRTS) projects are being undertaken across 13 cities, with the plan to introduce MRTS in 50 cities. Afcons built India’s first underwater Metro tunnels for Kolkata Metro below Hooghly River in just 67 days, and is also constructing the country’s deepest Metro station at Howrah. We are among the first Indian infrastructure companies to have constructed an underground Metro station without a foreign JV at Barakhamba in New Delhi. Recently, we also completed the construction of one of Asia’s biggest Metro stations, Chennai Central.

Processes or mandates for quality
An ISO 9001:2015 certified company for quality of work, Afcons is also OHSMS ISO 45001:2018 certified. We follow an approved Standard Quality Assurance plan for every project as well as specific Quality Assurance plans, which form part of our contract. Also, construction material, including cement, reinforcement and structural steel, is sourced directly from primary manufacturers. We ensure further quality checks in laboratories at sites as well as by third parties. Every lot of construction material is sampled at prefixed intervals and tested before use. This streamlines the entire process and provides the best output.

Technology innovations

  • We have used the under-slung method of segmental construction to facilitate lighter launching system capable of negotiating sharp curves. This was further improvised to negotiate portals without dismantling by temporarily raising the launching of spans and thereafter lowering them. 
  • We have implemented top-down methodology for underground station construction to reduce the temporary structuring requirement. 
  • For certain projects, we have used temporary staging to facilitate the launching of truss walk over the station location without complete dismantling.
  • The extensive use of steam curing to hasten concrete curing in winters has proved effective for us. Besides, we extensively use prefabricated steel spans, concrete girders erected by cranes, sacrificial formworks and additives like silica fumes and GGSB to improve overall construction quality.
  • Our engineers have designed a customised staging system to erect spans without launching truss to be used at difficult locations.
  • Another example of innovation in Chennai was the use of plunge column construction by Wirth Rig, also known as Reverse Circulation Drilling (RCD), to penetrate higher grade rock for pile construction. In Chennai, we have also successfully retrieved a TBM from a bentonite flooded shaft.
  • We used the overcut method for D-wall construction using a trench cutter and an innovative blade saw cutting method for cross-passage sump excavation.
  • To negotiate loose soil strata, we have implemented tam grouting from surface for ground improvement. This has helped stabilise loose pockets over rock during mixed-face tunnelling.
  • For Nagpur Metro, our in-house team has designed a double-decker launching girder that can negotiate a radius up to 200 m.
  • Our engineers have also designed a ‘Softeye’ using styrofoam to ensure that TBMs can cut smoothly through D-walls. Also, special stripping stop-ends imported from Germany were used for the first time in India for Kolkata Metro.

Afcons Infrastructure Ltd has been on the Metro construction landscape since it was first introduced in India, with Kolkata Metro commencing operations in 1984. Subsequently, for Delhi Metro, the Shapoorji Pallonji Group company secured an elevated Metro package in 2000 and completed the 4.5-km construction in 2003. Since then, it has completed over 42 kms of elevated Metro construction, underground station construction and aero-city alignment in the national capital. At present, Afcons is building Metro rail infrastructure in Kolkata, Ahmedabad, Nagpur and Chennai. “We have constructed over 100 kms of Metro rail, and more than 30 elevated and underground stations in five Indian cities,” says R Anantakumar, Executive Vice President, and BU Head, Urban Infrastructure, Afcons, as he shares the company’s key achievements in the segment...Success of Metro rail projects in IndiaIn India, Metro Rail Transit System (MRTS) projects are being undertaken across 13 cities, with the plan to introduce MRTS in 50 cities. Afcons built India’s first underwater Metro tunnels for Kolkata Metro below Hooghly River in just 67 days, and is also constructing the country’s deepest Metro station at Howrah. We are among the first Indian infrastructure companies to have constructed an underground Metro station without a foreign JV at Barakhamba in New Delhi. Recently, we also completed the construction of one of Asia’s biggest Metro stations, Chennai Central.Processes or mandates for qualityAn ISO 9001:2015 certified company for quality of work, Afcons is also OHSMS ISO 45001:2018 certified. We follow an approved Standard Quality Assurance plan for every project as well as specific Quality Assurance plans, which form part of our contract. Also, construction material, including cement, reinforcement and structural steel, is sourced directly from primary manufacturers. We ensure further quality checks in laboratories at sites as well as by third parties. Every lot of construction material is sampled at prefixed intervals and tested before use. This streamlines the entire process and provides the best output.Technology innovationsWe have used the under-slung method of segmental construction to facilitate lighter launching system capable of negotiating sharp curves. This was further improvised to negotiate portals without dismantling by temporarily raising the launching of spans and thereafter lowering them. We have implemented top-down methodology for underground station construction to reduce the temporary structuring requirement. For certain projects, we have used temporary staging to facilitate the launching of truss walk over the station location without complete dismantling.The extensive use of steam curing to hasten concrete curing in winters has proved effective for us. Besides, we extensively use prefabricated steel spans, concrete girders erected by cranes, sacrificial formworks and additives like silica fumes and GGSB to improve overall construction quality.Our engineers have designed a customised staging system to erect spans without launching truss to be used at difficult locations.Another example of innovation in Chennai was the use of plunge column construction by Wirth Rig, also known as Reverse Circulation Drilling (RCD), to penetrate higher grade rock for pile construction. In Chennai, we have also successfully retrieved a TBM from a bentonite flooded shaft.We used the overcut method for D-wall construction using a trench cutter and an innovative blade saw cutting method for cross-passage sump excavation.To negotiate loose soil strata, we have implemented tam grouting from surface for ground improvement. This has helped stabilise loose pockets over rock during mixed-face tunnelling.For Nagpur Metro, our in-house team has designed a double-decker launching girder that can negotiate a radius up to 200 m.Our engineers have also designed a ‘Softeye’ using styrofoam to ensure that TBMs can cut smoothly through D-walls. Also, special stripping stop-ends imported from Germany were used for the first time in India for Kolkata Metro.

Next Story
Infrastructure Energy

Amazon Achieves 100% Renewable Energy

Amazon has achieved its goal of powering its global operations with 100% renewable energy, seven years ahead of its original target set for 2030, as reported. This significant milestone underscores Amazon's commitment to sustainability and its leadership in corporate renewable energy adoption. Amazon's journey towards 100% renewable energy began with a series of strategic investments in solar and wind projects around the world. These projects include large-scale wind farms and solar arrays that contribute substantial amounts of clean energy to the grid. By reaching this goal early, Amazon has ..

Next Story
Infrastructure Energy

Faster Renewable Expansion Needed: IRENA

The International Renewable Energy Agency (IRENA) has emphasized the urgent need for an accelerated expansion of renewable energy to meet global 2030 targets, as reported by the Economic Times. According to IRENA, current efforts are insufficient, and a substantial increase in the deployment of renewable energy technologies is crucial to achieving climate goals and ensuring sustainable development. IRENA's latest report highlights that despite progress in renewable energy adoption, the pace of growth must triple to align with the targets set in the Paris Agreement. The report stresses that ren..

Next Story
Infrastructure Energy

SECI Announces Green Hydrogen Tender

SECI's Green Hydrogen Tranche-II tender is designed to attract investments and partnerships in the green hydrogen sector. The tender aims to promote the development of green hydrogen projects across the country, leveraging India's vast renewable energy resources. This move aligns with the government's National Hydrogen Mission, which focuses on creating a sustainable hydrogen economy and reducing carbon emissions. The tender seeks proposals from companies and consortiums capable of establishing large-scale green hydrogen production facilities. These facilities will utilize renewable energy sou..

Hi There!

"Now get regular updates from CW Magazine on WhatsApp!

Join the CW WhatsApp channel for the latest news, industry events, expert insights, and project updates from the construction and infrastructure industry.

Click the link below to join"

+91 81086 03000

Join us Telegram