At the International Symposium of NO DIG BERLIN 2017 Mr. Tim E. E. Becker will give a presentation together with Mrs. Ingeborg Friedrich-Keil from IFK Ingenieurbüro für Geotechnik and Mr. Ralf Schubert from Berliner Wasserbetriebe with the title Pipe Jacking ID 1.600 with Manned Shield under Air Pressure – Undercut of Berlin’s Infrastructure under difficult Conditions:
For more than 150 years Berliner Wasserbetriebe supply Berlin an its surroundings with drinking water as well as rain water and sewage treatment. Steady investments into the net infrastructure and its adaption to a continuous increasing number of citizens are main goals of Berliner Wasserbetriebe.
The project presented shows the renewal of a sewage pressure pipeline ID 300 St under existing railways of local S-Bahn as well as regional and intercity trains, in total nine tracks of Deutsche Bahn AG plus an exit of the regional road B96a.
The result oft he planning process was to build a reinforced concrete pipe jacking tunnel ID 1600 with a new and curved alignment in which two sewage pressue pipelines ID 500 and ID 600 ouf ductile steel are inserted. The ID 500 pipeline was connected to the existing net, the ID 600 pipeline serves as backup line for future demands.
The soil examination showed silty, middle dense packed sands with coal pieces above a boulder clay horizont with embedded stones and stone fields. Due to high gorund water level the construction of the jacking and the reception shaft was planned with wall-pit-floor-method consisting of overcut bore piles and a high level grouting pit floor.
Due to soil and groundwater conditions and to the very limited possibility to remove obstacles from the ground surface, the pipe jacking was executed by an open shield with manned operation under air pressure.
Deutsche Bahn AG demanded a continuous 24/7 operation of the pipe jacking works as well as a detailed measurement program in order to check the position of the railway tracks. A steady backup by a railway construction team was also necessary.
The positive teamwork between the construction company, the client, the project partners of Deutsche Bahn AG and expert’s supervision lead to a succesful completion of the works with minimal settlements of appr. 1 mm and without greater interruptions of the railway traffic.