Restoration of the Schwarzatal dam in the southern Black Forest
Location:
Houses
Build time:
05/2018 - 11/2018 and 03/2019 - 12/2019
Client:
Schluchseewerk AG
Restoration of the Schwarzatal dam in the southern Black Forest
The Schwarzatal dam is located near the municipality of Häusern in the Black Forest and was built between 1929 and 1931. It is a pumped-storage reservoir and is used to generate electricity as part of the Schluchseewerk AG pumped-storage network.
The dam is an approx. 160-metre-long and 43-metre-high gravity wall with eleven blocks, the length of which varies between 11 and 20 meters. The crown is accessible via a 2.80 to 3.10-metre-wide service road.
Parts of the air-side wall were renovated by ZÜBLIN Bauwerkserhaltung back in 2010. the water-side wall was then also repaired in 2018. The following year, in February 2019, Schluchseewerk AG once again commissioned ZÜBLIN Bauwerkserhaltung to repair the crown and the air-side wall.
Measures on the water-side wall
- Removal of the old coating containing PAHs
- Removal of damaged old concrete using high-pressure water jets (HDW)
- Installation of a solid, new reinforcement layer; anchored in the existing structure
- Reprofiling of wall surfaces with concrete in accordance with ZTV-W IB 219
- Reprofiling of the suction lifters with shotcrete according to ZTV-W IB 219
Measures on the air-side wall and crown
- Demolition of the old parapets and decking on the crown
- Construction of an approx. 5.20 m wide and 400m2 large concrete roadway slab, including railings and light poles
- Connection of the cantilevered slab to the wall body using threaded rods and bonded anchors
- Removal of up to 10 cm of concrete from all surfaces in the area of the lifting systems and reprofiling with shotcrete
- Removal of 15 cm of concrete from the wall with HDW on approx. 1000m2
- Construction of an approx. 30 cm thick reinforced facing shell; connection to the existing structure with over 5000 bonded anchors
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