Technical specifications

Scope of work:

• Start shaft diameter: Ø 15 m, depth: 22 m
• 600 m single-track cross-section excavated area = 36 m²
• 200 m double-track cross-section excavated area = 70 m²
• 70 m enlargement section excavated area = 36 m² - 60 m²
• 30 m branch-off section, three-bay excavated area = 185 m²
• 100 m station tubes excavated area = 62 m²
• 80 m station section, three-bay excavated area = 138 m²

Construction method:

• Sprayed concrete lining (SCL) method with tunnel excavator, partly with pipe umbrella support system
• cut and cover method:
  western and eastern railhead of the stations with accesses
  100 m closed ramp as a double-track rectangular cross-section
  120 m open ramp as a retained cut

Geology

• Marl stone
• weathering zone of sandy, gravelly and silty clays