Service tunnels,
Tunnelling
East Side Combined Sewer Overflow ESCSO
TBM drive with exceptionally small level of allowable settlements. For optimization of construction sequence an innovative TBM transfer concept was developed using lifting and transport systems that required only the disassembly of the tail skin and allowed transfer of the entire TBM in one piece. For [...] carried out prior to segment production. The geological conditions of the Troutdale Formation along the tunnel alignment can be described as gravel alluvium consisting of medium dense to very dense, poorly graded gravel, cobbles and scattered boulders in a sandy to silty/clayey matrix. Depending on seasonal [...] Willamette River. Key Figures Realization 2005 – 2011 Total length L = 8,800 m Excav. cross section A = 47.05 m2 Geology Troutdale Formation, Sand/ silt Alluvial soil, 85% in dense, poorly graded gravel Implenia on site Implenia Construction GmbH, Civil Engineering Landsberger Straße 290 a, D-80687 Munich Scope[...]