Inspection passage (dam)

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Inspection of the Oleftalsperre in the area of ​​the valley floor

An inspection passage is a tunnel passage within a dam ( dam , dam , dam ). The passage is located inside the structure, often in the foundation base. It is used to carry out controls and measurements, for example of the seepage water, the sole water pressure or deformations. Leachate can be easily collected and drained in the inspection aisle.

The dam wall or the subsurface can also be grouted from the inspection corridor to seal the wall against seeping water or to create a sealing curtain. Dams that were built according to the Intze principle usually had no inspection corridor in their original condition. Nowadays, when these dams are being rehabilitated, an inspection corridor is built in later. This often happens when the dam is empty by concreting a new inspection corridor in front of the dam. Subsequent installations of inspection corridors can, however, also be excavated using a tunnel boring machine or conventional driving (blasting), even if the dam is dammed. Control corridors usually have sufficient headroom.

There are different opinions among dam builders about the necessity of an inspection tour in dam structures. An inspection tour only makes sense where the dam or dam can be built on solid rock.

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