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Syphon construction under nature reserve Löcknitztal by microtunnelling

The project:

Pipe heading DN 1600 by micro-tunnelling with reinforced concrete driving pipes for passing under the nature reserve Löcknitztal near Kienbaum (Land Brandenburg) as protective pipe for a high-pressure gas pipeline DN 1100.


Ruhrgas AG/Verbundnetz Gas AG

Executing company:

Gildemeister Tief-, Stahlbeton- und

Rohrleitungsbau GmbH&Co. KG Berlin

The problem:

Pumping off the supporting liquid (bentonite suspension) used in the tunnel during pipe heading.

Our solution:

Application of a submersible pump Type KTZ35.5 connected with an accompanying pipe line DN 100 for continuous removal of the supporting liquid during the whole time of pipe heading.

The pump was always positioned at the lowest point of the syphon and operated on snore mode.

In the event of abrasive and corrosive utilization, stronger wear and tear will take place naturally in certain components. With regards to the above application wear and tear can take place mainly in impeller, agitator, suction plate, shaft sleeve, oil ring, mechanical seal, pump casing, strainer, motor casing and discharge coupling. Depending on the working conditions the lifetime of those parts might vary significantly and can be shorter than the legal warranty period.
In this regard, please pay attention to our general terms and conditions that we also send to you by mail on request.