The market demand for very long tunnels has increased in recent years. “Some of these projects are in mixed ground conditions (rock and loose soils) and thus the traditional types of TBM are not adequate. Double shield TBMs are not suitable for soils and, at the same time, EPB single shield TBMs’ advance rates are typically low in hard rock sections,” says Seli. The new EPB-Double Shield Universal TBM has been developed by SELI in a bid to plug this market gap.
Claimed features of the new machine include: The ability to work in Double Shield Mode when boring in rock and in EPB Single Shield mode when boring through soil; The option of a screw or a conveyor and/or with a conveyor with closable doors.
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The EPB-Double Shield Universal TBM shares several design characteristics with the DSU TBM family including concentric shields to cope with high squeezing conditions and extended capacity to treat the ground ahead of and through the face.
The first SELI EPB-DSU TBM is currently boring the 12km long, 8m-diameter Headrace tunnel for the Beles Multipurpose project, in Ethiopia. This tunnel runs for almost 10km in hard basalt formations and, for the last 2km, in soft lake deposits.
SELI
Tel: +39 06 5929241
Email: selispa@selitunnel.com
Web: www.selitunnel.com
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By GlobalData
SELI’s EPB Double Shield Universal TBM
