Construction—EMEA—Germany—Excavations
The Bad Cannstatt Tunnel: DYWIDAG Strand Anchors stabilize
Smoke Removal Structure in Heilbronner Street
Within the scope of the major project Stuttgart 21, approval section 1.5, Lot 3, the Bad Cannstatt Tunnel
is being advanced. The approximately 3.8km long railroad tunnel will connect Stuttgart Main Station with
the new Neckar Bridge.
Photos reprinted courtesy of GBS Grundbau Bohrtechnik Spezialtiefbau GmbH & Co. KG, Germany
In order to provide mechanical ventilation of
the tunnel and the station in the event of a
fire, several smoke removal structures must
be built. This project also includes the smoke
removal structure near the intersection of
Heilbronner and Moenchhalden Streets.
It incorporates a ventilation shaft that will be
connected to the tunnel tubes via ventilation
galleries. The structure consists of a mainly
subterranean operation and ventilation
building, two 5m high vent stacks above
ground and a staircase. of temporary anchors because they are
suitable for a service period of up to 7 years.
An internal company approval from the
Client – the Deutsche Bahn AG – was
necessary before the semi-permanent
DYWIDAG Strand Anchors could be used.
As the DYWIDAG Strand Anchors comply
with a general technical approval, they
were approved by the test association
Dr.-Ing. A. Städing, and DSI’s customer
GBS Grundbau received the DB AG’s
permission for installing them.
The excavation was built using a Berlin-type
support system and tied back using strand
anchors. Construction work is scheduled
to take more than 2 years. Therefore, semi-
permanent anchors were used instead 419 semi-permanent Type 4-0.6" DYWIDAG
Strand Anchors including anchor heads were
installed in the walls of the Berlin-type support
system. The strand anchors had a total length
of 8,750m and a total weight of 40t.
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Owner
Joint Venture Tunnel
Cannstatt S21, Germany
Contractor
GBS Grundbau Bohrtechnik
Spezialtiefbau GmbH & Co. KG,
Germany
Engineering
Wayss & Freytag Ingenieurbau AG,
Germany
Operator
DB Station & Service AG, Germany
DSI Unit
DYWIDAG-Systems International GmbH,
BU Geotechnics, Germany
DSI Scope
Production, supply, technical support
DYWIDAG Products
419 semi-permanent Type 4-0.6" DYWIDAG
Strand Anchors including anchor heads