Dec 11, 2017
Expansive Metro Project Will Provide Transportation Within Rapidly Developing City
Robbins EPBs are built one third heavier than any other EPB on the market and are designed for 10,000 hours of usable life, making them ideal machines for use over many kilometers. “Robbins is known for designing resilient machines,” said Mr. Gopal Dey, Afcons Senior Manager. “For this project, we needed a machine that was specifically tailored to project conditions from soft clay to mixed ground with rock. Robbins EPB TBMs have unique design features that optimize the machine for the geology."
After completing its original twin tunnels, the EPB was refurbished in preparation to bore its latest 1.8 km (1.1 mi) section. During refurbishment, the inner seal greasing system was changed from auto to manual mode and the foam nozzle system was modified. These changes optimized the machine for excavation in the highly variable mixed face conditions encountered in the first two tunnels.
The EPB was launched earlier this year. According to contractor Afcons, the machine faced a major challenge right out of the gate. “When the TBM came out of the launching shaft, a few rings were erected and then the machine had to cross a live railway track, which meant there would be a possibility of ground settlement,” said Afcons Director, Mr. Manivannan. “At this stage, we had to closely monitor TBM face pressure and advance the machine at a uniform rate to ensure proper primary grouting.” The bore’s geology mainly consisted of clayey sand and about 60 meters (197 ft) of mixed ground.
“We [Afcons] chose this machine for this project due to the underground geology in Chennai, which continuously changes from soil to mixed ground,” said Mr. Dey. “We also liked that Robbins EPB machines are designed with active articulation to allow the machine to turn or steer with ease.” During active articulation, thrust cylinders react evenly against the entire circumference of the tunnel lining, even in a curve—a design that eliminates the problem of tunnel lining deformation. “This feature enabled the machine to negotiate through well-controlled conditions,” added Mr. Manivannan.
With all three tunnels, Robbins Field Service members were on location to assist and support as required. During the course of each bore, Robbins was there to advise Afcons on how best to maneuver through challenging ground and provide instruction for machine operation. The ability of
This latest tunnel connects multiple stations along the metro line, starting from Washermenpet through to Sir Theagaraya and to Kurukpet. The Chennai Metro Project will provide much needed transportation to a rapidly developing city.
Jan 19, 2018
Global pipeline infrastructure specialist Aquam Corporation has announced the appointment of Tim Bowen as Managing Director for the UK, Europe and the Middle East.
Jan 18, 2018
The Trenchless Technology Center (TTC) at Louisiana Tech University (LA Tech) is pleased inform you that we are partnering with the ASCE UESI (Utility Engineering and Surveying Institute) and the National Utility Contractors Association (NUCA) to offer the 2nd UIS. ...
Jan 18, 2018
MGX Minerals Inc. is pleased to report that engineering partner PurLucid Treatment Solutions has partially commissioned the commercial-scale NFLi5 lithium recovery system at its new manufacturing facility in Calgary, Alberta.
Jan 17, 2018
This free paper lists the top 10 factors to consider when choosing an inspection crawler.
Jan 16, 2018
Schenectady County, New York chooses InfraSteel liner for its Duanesburg Churches Road Bridge Project. County engineers noticed that the 27-year-old corrugated metal arch showed corrosion and needed repair.
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Jan 12, 2018
Industry association British Water has strengthened its team of International Business Mentors with the appointment of Shaun Stevens, business development manager, EPS Water.
Jan 11, 2018
Set to open in December 2017, the new Petronas Lubricants Global Research Center in Santena, Italy, is built on a waterproof below-grade concrete structure that features PENETRON crystalline technology to provide integral protection from high groundwater levels.
Jan 10, 2018
Whether it's a world record with the longest railway tunnel on earth at the Brenner or the epoch-making Gotthard project: the business of mechanized tunnel boring through hard rock is currently reaching new heights in Europe. Now Scandinavia is discovering ...
Jan 09, 2018
New plant technology was officially unveiled at Cranfield University that will enable researchers to remove and recover nitrogen and phosphorus from wastewater for use by the fertilizer and chemical industries.
Jan 08, 2018
Organizers of PLASTIC PIPES XIX report that Gold level sponsorship of their Conference and Exhibition is now complete with the addition of McELROY and LyondellBasell.
Jan 05, 2018
The Pennsylvania Public Utility Commission unanimously approved a settlement that allows Pennsylvania American Water to raise water and wastewater rates, effective January 1, 2018. The primary factor behind the rate increase is the approximately $1.26 billion of investments to replace ...