Double lock Geesthacht - Verification of the stability of the lock towers due to changed boundary conditions and the chamber walls due to MIC and investigation of solution variants to realize the operational capability of the lock until the year 2050

in short: Determination of the stability of the towers and chamber walls

The replacement of the stacking gates and the electrical and mechanical systems at the Geesthacht double lock led to a change in the loads on the towers as a result of larger dead loads on the new gates and counterweights. The Geesthacht double lock already shows various damage patterns. It is important to determine whether these are related to the replacement of doors, etc., whether the operational safety or stability of the entire system is endangered and how the existing structure is to be dealt with in the medium and distant future (> 20 years) and in what form a basic repair or a necessary replacement is necessary or possible.

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For the first step of the preliminary investigations at the Geesthacht double lock, an as-built survey, the recalculation of the towers, heads and chamber walls, the assessment of the damage to the central wall and the causes and effects of microbially induced corrosion (MIC) have to be examined and evaluated, as well as the sheet piling statics at the OVH:

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- Inventory and mapping of damage patterns

- Recalculation of all 6 towers according to TbW (BAWMerkblatt_Tragfaehigkeit_Wasserbau-werke_TbW_2016 (1)

- Examination of the concrete chamber walls for damage patterns on concrete and reinforcement and component movements and verification of stability in critical areas

- Investigation of bacteria in water and soil and evaluation of the sheet pile thickness measurements carried out by the WNA MD and static verification of the sheet pile walls.

- Evaluation of the results, evaluation of the operational safety of the lock system from a design point of view and development of the necessary measures