TBM RECORDER
Goals reached in Hong Kong and Rome
Mar 2012
SELI News Releases
- Half a world apart and just days from each other, SELI celebrated two significant breakthroughs.
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Double shield SELI TBM completes difficult Tsuen Wan Drainage drive
- In Hong Kong, the 5.1km long Tsuen Wan Drainage Tunnel holed out. The breakthrough came following severe geological conditions just metres from the tunnel's end that required the best of SELI's field resources to negotiate poor formations under shallow cover and near important infrastructure.
- The 5.1km drive was excavated through volcanic tuff and hard granodiorites using a robust hard rock TBM designed and built by the company. The 7.27m diameter double-shield TBM drive was lined with precast segments to a 6.5m internal diameter and completed under a HK$1.123 billion (€99.25 million) contract awarded by the Hong Kong Drainage Services Department to the Maeda-CREC-SELI JV. Tunnelling started in 2009, following detailed engineering and planning that enabled heavy construction operations to take place from limited work sites and within a congested urban context.
- The TBM and other tunnel facilities are currently being dismantled ahead of works to complete the project. The drainage tunnel will be used to catch stormwater from hillside streams and reduce the risk of floods in the Tsuen Wan area.
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Excavation complete for the Metro B1 Line extension in Rome
- Just days before in the company's home country and home city of Rome, Italy, SELI teams completed a third extension of the Metro B1 Line running from Conca d'Oro to Piazzale Jonio. Excavation of the line was managed by the developer, Roma Metropolitane, and the main contractor, A.T.I. Salini Costruttori-Tecnimont, with SELI completing the excavation as principal subcontractor.
- EPB excavation began in June, 2010 with the machine progressing since November 2011 through 522m of critical conditions as a result of clay and friable soil.
- For SELI this breakthrough is the third success story in little more than three years at the B1 Metro line worksite. The other two milestones were completion of the Conca d'Oro-Gondar portion at the end of 2009 and of the Conca d'Oro-Piazzale Bologna section in September, 2010.
- The final tunnel drive measures 1.1km in length with a diameter of 10m.
- SELI enjoys wide recognition by both the consortium of companies involved in the Rome project, and worldwide, as a lead tunnelling contractor.
- Metro breakthrough in Rome - TunnelTalk, September 2010
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