Orientation about the project
Søndra Länken is a 6 km long traffic line under Stockholm’s Søndra
nearby areas. SL24 is one of many works going on at the same time.
The work at the Sickla traffic area included the sealing of
the soil/moraine layer between UK piling and rock. The sheet pile wall’s total
length was 270 metres.
Basic conditions
Larger parts of the area consist of fill masses with varying
power (0 to 3 meters). Under the embankment are mountains, the moors,
dry crust clay and a maximum of 5 meters of clay. The moraine is silty and
simultaneously contains stone and blocks.
Problem statement
Sealing of sheet piling against the underlying rock surface. The piles stayed
installed after it was pre-drilled through pre-installed pipe on
the pile and down 0.5 meters into the mountain. The height of the jet pile wall varied from
0 to 3.5 meters depending on how deep the piling was rammed down.
The requirements for density were 5×10-9 m/s. The C/C distance between the piles was
600mm. 450 piles were installed. The piles were installed at a depth of 6
to 14 meters.
Skanska AB
