Strengthening of the supporting structure, Strullendorf lock

The lock at Strullendorf, located downstream just after Bamberg, was put into operation in 1968 and is therefore one of the oldest locks on the Main-Danube Canal. An inspection had revealed corrosion in the reinforcement of the eastern chamber wall. In order to reinforce the structure as a preventive measure, PORR Spezialtiefbau was commissioned by the Nuremberg-based RÖDL BAU.GRUPPE to produce 40 permanent single-rod anchors. In addition to the high quality of execution, the special civil engineering team from PORR's Stuttgart branch scored points with a significantly reduced construction runtime.

The structure is designed as a single-chamber lock with an adjoining economising basin. It has a chamber length of 190 m, a usable width of 12 m, as well as a lifting height of 7.4 m and a total height of 12.61 m. A structural inspection had revealed corrosion in the existing reinforcement. As there was no longer sufficient load-bearing capacity, a preventive structural reinforcement at the wall head of the eastern chamber wall was to ensure stability for at least another 50 years. For the repair work, PORR special civil engineering produced 40 single-bar permanent anchors, each 21.40 m long.

Special solution for working level reduces runtime by almost two weeks

After the lock was closed to shipping traffic in April 2024, the existing cantilever slabs could be demolished.

Watch our project video* :                                                                                                                             PORR Deutschland . Lock, permanent anchor

The big challenge was to place the drilling rig securely on the chamber wall without filling the trench or using a floating pontoon. In close cooperation with the client, RÖDL BAU.GRUPPE, which is implementing the measure on behalf of the Aschaffenburg Waterway Construction Office, a special construction made of precast concrete cubes, as well as a combination of steel girders and steel plates, was developed in advance. A risk assessment was prepared for this individually designed working level and the construction site team was instructed accordingly. ‘During the site inspection, an employee of the consulting firm for occupational health and safety expressly praised the safety of the solution, as well as the good preparation and documentation,’ says PORR project manager Benedikt Lohoff.

* (Videoplattform Vimeo)