Metro breakthrough in Rome
Metro breakthrough in Rome Sep 2010
SELI News Release
SELI has completed the first tube of the metro B1 Line extension in Rome. The occasion was recorded when TBM S-387 knocked down the diaphragm wall at Piazza Bologna Station. The company will now dismantle the TBM and auxiliary equipment over the coming six to eight weeks while anticipating final breakthrough of the parallel running tunnel TBM by mid-November 2010. Over the coming month, SELI will complete also excavation of the new Line B extension north between Conca D'Oro and Jonio stations using a third 9.75m diameter TBM.
Finish for the first running tunnel tube

Finish for the first running tunnel tube

The contract for the B1 Line extension was awarded to the Salini Costruttori - Tecnimont JV by the client, Roma Metropolitane, and SELI was awarded the subcontract to excavate and line the two, 2.7km long sections of twin running tunnels with rings of 35cm-thick segments in a six segments plus key configuration.
The two 6.78m diameter EPB DSU (Double Shield Universal) TBMs were manufactured according to SELI specifications by Herrenknecht and worked from two opposite portals to complete the two parallel tunnels. As well as engineering the tunnelling systems, SELI was also in charge of manufacturing auxiliary equipment, including the backup systems, rolling stock, and the continuous muck haulage conveyor systems supplied by Continental.
The two machines progressed at up to 30m below surface and maintained an impressive daily average of 16.8m/day or 12 rings/day, while working at 3-5 bars of EPB pressure.
Line B1 extension of the Rome Metro

Line B1 extension of the Rome Metro

Excavation proved challenging due to complex hydro-geological conditions along the alignment and sensitive buildings on the surface above. The geology comprises loose clay and silt soil with a high groundwater table.
The new metro line goes through one of the most urbanised areas of the Italian capital that is characterized by numerous historical buildings and the high potential for unearthing archaeological finds. SELI successfully bored under buildings, avoiding surface settlements and any consequent structural failures of the critical buildings. Along the route the TBMs also successfully underpassed the Aniene River.
Excavation was completed as scheduled in about two and a half years to confirm SELI's high level of reliability in underground work and its capability for confronting even the most critical of situations.
Second Gondar extension breakthrough Jul 2010
SELI News Release

Twin breakthrough at Annibaliano station

The twin 6.77m diameter Herrenknecht EPBM S-388 working on the new Line B1 extension of the Rome Metro entered the intermediate station of Annibaliano on June 25th to complete the twin running tunnels from Gondar station. The previous parallel tunnel breakthrough took place on May 10th. Since April 2010, the TBM had advanced 841m or 601 rings and progressed with an average daily output of 13.6m/d.
The TBM S-388 arrived at the Annibaliano station on June 14th but the actual breakthrough was delayed until June 25th due to maintenance and other set up modifications to the tunnel conveyors.
SELI personnel are now 'walking' the TBM through the station box to the opposite end wall from where it will begin the last section of tunnel to Bologna station. Cutterhead maintenance and repair will be performed before boring restarts.
Another leg of the Rome Metro completed May 2010
SELI News Release

Breakthrough at Annibaliano station

Breakthrough on May 10th of the 6.77m diameter Herrenkencht EPBM S-387 in Rome has another section of running tunnel for the city's Metro excavated. Entering the station of Annibaliano is an intermediate stop for the TBM on its journey to Conca D'Oro for the Metro system's Line B1 Gondar Extension.
After the breakthrough at Gondar in December 2009, excavation resumed in early 2010 towards Annibaliano station. By February 2010, the TBM had advanced about 877m and at an average of 16m/day and an average monthly advance of 219.45m.
On May 5th 2010, the TBM, being operated by subcontractor SELI, reached the bulkhead only to discover ground water in the excavation chamber. SELI management with the managers of the main contractor, decided to inject mono-component resins behind the ring installed in the jet-grouting stretch in order to create a waterproof buffer. After discharging pressure and checking and changing cutterhead tools, the TBM was able to knock down the concrete diaphragm on May 10th to breathrough successfully into the station box.
In upcoming days, the two Herrenknecht EPBM shields will advance for about 20m. SELI personnel will then carry out maintenance and operations to restore the cutterhead to its original condition.
Rome awards Metro extension contract - TunnelTalk, February 2010
Rome Metro adds more underground route - TunnelTalk, December 2009


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