Infrastructure,
Special Foundations
Zurich cross-city link, lots 3.1 / 3.2, underpinning of southern section and access shaft
walls were reinforced horizontally using five layers of permanent anchors. The lowest anchor heads are situated 11 m below the groundwater level, directly within the reach of the Limmat River. Specially developed drilling preventers and anchor sleeves were used to install the anchors. The mining technique [...] technique In what was possibly a world first, a method based on mining techniques was used to underpin the southern section. In a westerly direction, two longitudinal tunnels – each 110 m long and 6 m high (base to roof) – were driven out of the shaft up to the section 2 lot limit (Löwenstrasse transit [...] enter the target shaft in the southern section of Zurich main station, a sealing block 16 m long, 17 m wide and 17 m high was created in the Limmat direction by means of low-pressure injections into the ground. The aim of this measure was to increase the strength and decrease the permeability of the ground[...]