Technical specifications

Lot 1: Driving of access tunnel

  • L approx. 80 m and start cavern
  • V approx. 1,000 m³
  • Construction of 2 pressure partitions(walls)
  • Extension of access tunnel incl. tunnel portal
  • Infrastructure provisions

Construction method

  • Drill and blast
  • SCL inner lining


  • Mainly dolomite

Lot 2: driving of target shaft

  • D = 7 m
  • T approx. 40 m
  • Target cavern L approx. 15 m

Construction method 

  • Drill and blast
  • SCL inner lining


  • Mainly dolomite

Lot 3: TBM driven seepage water tunnel

  • D = 3.0 m
  • L approx. 160 m

Construction method

  • Pipe jacking with reinforced concrete pipes
  • L = 2.8 m
  • Installation of two soft gel seals respectively in the transition area between rock and dam fill

General data

Sylvenstein Dam BA (construction lot) 3
construction of a new seepage water tunnel
Lots 1-3

Wasserwirtschaftsamt (water authority) Weilheim for the Free State of Bavaria

Wayss & Freytag Ingenieurbau AG

Construction period
March 2013 to July 2014

Construction costs
approx. € 5.6 million




Seepage water tunnel
160 m
Construction Method
Pipe Jacking
Related Projects
Katzenberg Tunnel
Katzenberg Tunnel

Parallel drive with two TBMs with EPB shields for the extension of the Karlsruhe – Basel motorway.

Read more

4 km tunnel for a 48-inch gas pipeline between Rysum (D) near Emden and Midwolda (NL).

Read more
Limmern Access Tunnel I
Limmern Access Tunnel I

1,700 m above sea level: In the Linthal Project 2015 the inclined tunnel with an incline of 24 % compensates an altitude difference of 900 m in the high mountains of Switzerland.

Read more

Cookies Policy

Our website uses cookies to improve your experience. Certain cookies can contain personal information. We deactivate Cookies, unless you allow Cooky usage.
Additional information

Allow Cookies
Do not allow cookies
Cookies Settings