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| NEWS


Buenos Aires water tunnel TBM progress


Granite wins Ohio tunnel US – Granite Construction has won the contract the Northside Interceptor Tunnel (NSIT) contract in Akron, Ohio. Contract value is US$215m. The entire project is scheduled to be completed in mid 2027. NSIT is designed to prevent combined


sewer overflows (CSOs) from entering the Cuyahoga River during typical storms. It will be financed by the Ohio Environmental Protection Agency’s Water Pollution Control Loan Fund. The 2.03km-long (6,660ft) interceptor


tunnel is the project’s primary structure and will collect, store – and attenuate, overflows at four locations. The precast concrete, segmental lined 5.03m i.d. (16.5ft) sewer will have storage capacity of more than 37,850m3


(10 million gallons) and run Above: Second Terratec EPBM on Buenos Aires water tunnel SOURCE: TERRATEC


ARGENTINA – The second of two EPBMs has been launched for the Río Subterráneo a Lomas tunnel in Buenos Aires. Italian contractor CMC di Ravenna


has deployed the Terratec machine (S73, named ‘Juana’) for the final 5km (3.1 miles) length of the water supply tunnel. Shortly after launch, by the time it had erected 88 rings the EPBM had excavated 123.2m (404ft) in one week. The 13.5km-long (8.4 miles) Río


Subterráneo a Lomas tunnel is a part of the multi-billion dollar Agua Sur system being built by Argentina’s national water and sanitation company AySA. It is the country’s most extensive water infrastructure project in four decades, providing fresh water access to 2.5 million inhabitants in the southern metropolitan area of Buenos Aires. The first EPBM (S74, ‘Eva’) was


launched in September 2020. It completed the first drive, comprizing an 8km-long section of the tunnel, at the end of 2022. To launch the first machine


during the Covid-19 pandemic, CMC di Ravenna and Terratec secured permission from Argentina embassies in different countries to send a team of international technicians to the project site. The EPBMs have been designed


to handle the diverse soft ground geology along the project alignment, encompassing silts,


sandy silts, and some cobbles. Equipped with high-torque soft ground cutterheads featuring a spoke-style design boasting a 49% opening ratio, the TBMs incorporate cutting tools comprizing multiple fixed and back-loading knife bits. This configuration enables not only rapid advancement but also minimizes interventions. Both EPBMs were launched


and received from shafts. The first launch shaft has four interconnected circular sectors at the bottom area. The shaft is 45m in length, 12m in width, and 25m in depth (148ft x 39ft x 82ft). The tunnel excavation is at an


average depth of 25m, commencing with an approximately 400m radius curve before continuing along a predominantly straight alignment, with a maximum slope of +/- 2%. As the machines progress, the water tunnel structure is built with an erected precast concrete lining ring of six segments (four parallelograms and two keys), each measuring 250mm thick and 1400mm wide. The Agua Sur System includes


several major infrastructure components, including: a raw water intake; a 23km-long (14.3 miles) water conveyance tunnel, built in two stages; two pumping stations; a 46km-long (28.6 miles) network of pipe connections. Also, the General Belgrano Water Treatment Plant to increase its production capacity.


up to 100ft (30.5m) below ground, into rock. Granite’s subsidiary, Kenny Construction,


completed the Ohio Canal Interceptor Tunnel for the City of Akron, designed to reduce CSOs into Little Cuyahoga River. That 1.9km-long (6,240ft) long tunnel is 8.2m i.d. (27ft), controlling overflows at nine locations and capable of storing more than 94,635m3


(25 million gallons). Tunnel


boring for the sewer was undertaken with a 9m-diameter Robbins Crossover TBM and completed in 2018.


Snowy 2.0 project reset AUSTRALIA – The cost of Snowy 2.0 pumped storage scheme has risen to A$12bn (US$7.8bn) and the JV builder is moving to an incentivized target cost contract model following a reset of the hydro scheme, the project developer recently announced. Snowy Hydro CEO Dennis Barnes


said the project reset would enable the commercially sustainable and successful delivery of the project. Snowy Hydro said the fixed price EPC


contract with Future Generation Joint Venture (FGJV) – consisting of Webuild and its subsidiaries Lane and Clough – was no longer fit for purpose and it will be moved to the new model. Snowy Hydro would settle all outstanding claims with the contractor. “Moving to an incentivized target


model with FGJV will result in closer collaboration, stronger oversight and alignment of interests between Snowy Hydro and FGJV, ” said Barnes. As part of the reset, Snowy Hydro is


increasing the scheme’s capacity by 200MW to 2.2GW with first generation in 2027.


Winter 2023 | 9


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