Aug 06, 2018
Massive Metro Project Will Improve Traffic and Rail Congestion in One of India’s Largest Cities.
Operation of these two machines will be carried out by Larsen & Toubro, part of the Larsen & Toubro -Shanghai Tunnel Engineering Co Joint Venture (L&T-STEC JV).The Robbins Company will provide key personnel for the initial boring phase.
“During the factory acceptance testing, we observed that the machine and back-up system are robust enough for hard rock tunneling,” stated Palwinder Singh, Head of Tunnel Operations for L&T-STEC JV.
During the bores, consisting of parallel 2.8 km (1.7 mi long) tunnels, geologic conditions will include mixed ground and possible water pressures up to 2 bar. According to Singh, “A Crossover XRE was chosen because of the expected geology,” which includes basalt rock and transition zones consisting of black carbonaceous shale, tuff, and breccia.
Rock strengths are anticipated to range between 15 MPa and 125 MPa (2,200 and 18,100 psi) UCS. The machines will bore with only 15 to 20 m (50 to 70 ft) of cover above the tunnel and the structure will be lined with reinforced concrete segments in a 5+1 arrangement.
The metro tunnels will run between the Cuffe Parade Station and Hutatma Chowk station, passing through the Vidhan Bhavan and Church Stations. Both Crossover machines will be launched from the same 25 m (82 ft) deep by 22 m (72 ft) long shaft at the Cuffe Parade Station.
“The limited length of the shaft requires running the TBMs for the first 100 m (328 ft) with some or all the back-up decks at the surface,” said JP Bayart, Robbins Project Engineer. “The TBMs and back-up systems are connected with umbilical cables and hoses.”
The TBMs will begin their excavation in hard rock mode. “Each cutterhead is optimized for operation in rock, as this is what is expected. The machines can also operate in soft ground thanks to the screw conveyor with bulkhead gate and discharge gate,” said Bayart. “The Robbins Torque-Shift System, consisting of two-speed shifting gearboxes coupled to the main drive motors, allows for the high cutterhead torque required for soft ground operation.”
The face of each machine is equipped with six muck buckets and six large internal muck loading plates. This design, in combination with the screw conveyor located at the centerline of each machine, will allow for the option of fully emptying the cutterhead chamber, resulting in minimal wear when EPB mode is not required. Muck will be removed from the tunnels via muck cars.
Assembly and launch preparations for the first XRE TBM began on 20 June and are estimated to take about six weeks. The second Robbins XRE TBM underwent factory acceptance testing at the end of May and will arrive at the jobsite at the end of July for its assembly. “Our target is to achieve an average of 250 m (820 ft) of boring per month,” said Jim Clark, Robbins Projects Manager India.
“The target to complete the boring operations is 20 months, which includes the additional time required for the short start-up using umbilicals on the initial drives, dragging the machines and re-launching through three stations.” Contractor L&T plans to work crews on double shifts to cover a full day of operations in order to keep to this timeline.
The machines will join two Robbins Slurry machines boring a separate contract of the Mumbai Metro Line 3. The first of those machines will be launching in August 2018. The Metro Line 3 project is estimated to be completed by 2021.
Aug 15, 2018
Leading pump hire specialist, Sykes Pumps, has enabled Seascale Water Treatment Works in Cumbria to successfully replace part of its plant, by providing an interim solution for a key filtration stage that was to be out of commission for a ...
Aug 14, 2018
Aqua America announced that its Pennsylvania subsidiary has signed an asset purchase agreement with Cheltenham Township to purchase its wastewater system, which serves approximately 10,500 connections in Montgomery County, for $50.25 million. The agreement must be approved by the Pennsylvania ...
Aug 13, 2018
Curing with Confidence and the free White Paper by Pipeline Renewal.
Aug 10, 2018
The national trend for pubs to orientate their businesses around food or even convert to restaurants can mean an upgrade in onsite wastewater treatment is required. This was the case at a popular Toby Carvery in Stonebridge, Coventry, which has ...
Aug 09, 2018
Sandvik acquires privately-owned Inrock, a leading supplier of rock drilling tools and services for Horizontal Directional Drilling (HDD) in North America. Headquartered in Houston, USA, Inrock is a market leader in pilot hole bits, reamers, guidance systems, accessories and services ...
Aug 08, 2018
Aug 07, 2018
The Latest Mobile App Makes StormTech Installation and Support Even Easier.
Aug 03, 2018
Oldcastle Precast is pleased to announce the BioMod® Modular Bioretention System has received equivalency approval from the Washington State Department of Ecology as a stormwater bioretention planter or planter box.
Aug 02, 2018
New resource sheds light on how cities can support infrastructure improvements with manhole inspections.
Aug 01, 2018
IDModeling, the nation’s leading provider of operations management and network intelligence software and services for water utilities, today announced the Company’s rebrand to “Sedaru” (See Data Run).
Jul 31, 2018
Westrade Group announced details for their biennial No-Dig Live Event, the UK’s only event dedicated to trenchless technology, which will take place 18th-20th September 2018 at the East of England Arena & Events Centre in Peterborough. This prestigious event will ...
Jul 30, 2018
Helping deliver cost-effective fluid management for utility contractors.