The Horkheim weir is located at the beginning of the ecologically very interesting old arm of the Neckar. The side canal branches off at the weir and leads to the Horkheim lock and the hydroelectric power station. The Horkheim flood barrier gate is located at the beginning of the side canal next to the weir system.
The gates installed in the weir fields have a total height of 7.60 metres. These riveted gates, which are now 90 years old, show extensive corrosion damage and in some cases considerable rusting. Furthermore, the spur gears used to drive the gates, which date back to the time of construction, are no longer up-to-date. The four 4.50 m wide weir piers are made of unreinforced tamped concrete with low strength and a large pore volume, which is prone to water penetration and the resulting frost damage.
The basic refurbishment of the weir includes individual measures such as replacing the old weir gates with roller gates with flaps, replacing the drives and the electrical and control technology. The weir and connecting footbridge will be repaired and the drive houses will be rebuilt. In addition, the 90-year-old concrete of the weir piers will be stabilised with cement injections. In order to prevent uplift of the weir base during inspection work, it will be secured with anchors.
Client: Wasserstraßen- und Schifffahrtsamt Oberrhein (branch Freiburg)
Processing period: 2024
Main data:
Year of construction: 1977
Dam target: NN + 123.60 m + 0.50 m surge (upstream), NN + 117.70 m (bottom sill), NN + 110.50 m + 0.50 m sunk (downstream)
Difference in height OW-bottom: dH = 6.40 m
Clear width: 25,780 mm (over all), 24,600 mm (span)
Closure height: 10,965 mm (over all), 6,600 mm (dam wall)
Locking weight: 79 tonnes (steel construction)
Services:
Technical processing of new upper gate (OT) (incl. optimisation with regard to weight potential/operability/maintenance etc.)
Preparation of technical documentation (structural calculations, design, execution and workshop plans, test plans, etc.)
Technical processing of OT assembly
Surveying of the OT niche