Construction of the interceptor in Dresden's old town centre. Linear Shoring: Making progress with large clearance
Jun 12, 2006
Sewer construction work in Käthe-Kollwitz-Ufer (road along the river bank) in Dresden got underway in September 2005. On behalf of Stadtentwässerung Dresden GmbH (the city sewers authority), the interceptor in the old town centre is being replaced from the stormwater tank in Johannstrasse to Bundschuhstrasse. A joint venture between Heinrich Lauber GmbH & Co. KG (technical management) and Braumann Spezialtiefbau GmbH (commercial management) is executing the first stage of the project in the Elbe meadows.
Unlike sheet piling, the shoring is not installed in its entirety in advance, but is inserted during ongoing excavation as work progresses. Four to ten modules of the shoring system – for these depths consisting of inner and outer base and top panels, Linear Shoring soldiers and roller units – are being employed on this project for a continuous length of up to 38 m.
According to everyone involved, the installation and extraction of the elements is proceeding just as smoothly as the insertion of the 3 m long reinforced concrete pipes with the Dresden cross section.
The non-standard cross section measuring DN 1982/2200 is distinguished not only by its flat base, but also by the fact that its cross section precisely matches the dimensions of the sewer cleaning vehicle that is constantly in operation keeping sewers clean in Saxony’s capital.
"Cleaning is based on a simple principle," explains project manager Dipl.-Ing. Heiko Nytsch, Stadtentwässerung Dresden GmbH. "The cleaning vehicle pushes a shield ahead of it which is kept slightly above the floor of the pipe but otherwise rests against the walls of the pipe." If the cleaning vehicle is held up by congestion on the floor of the sewer, the water jet escaping through the gap washes the obstacle out of the way. "After this, the vehicle propelled solely by the flow of sewage can continue its journey," Nytsch adds.
According to project manager Dipl.-Ing. (FH) Volker Preuss of Heinrich Lauber GmbH & Co. KG, a tightly meshed network of wells will lower the water table sufficiently. "The water table remains within the natural lower range and the trench is kept dry around the clock," Preuss explains.
After the pouring of the roughly 27 cm thick concrete slab to support the pipe, a mobile crane lifts the 16 t pipes into the trench. "Rapid progress overall is ensured by the size of module and by the fact that the position of the rigid roller units can be modified at certain stages of construction," explains Dipl.-Ing. Fritjof Heiland, consultant for Emunds+Staudinger GmbH. This is possible as soon as the concrete bed has achieved its minimum strength.
"In this situation, the excavator can raise the roller unit into the highest position that maintains the required structural strength," Heiland adds. In this way, sufficient space is created for the next tasks. When the reinforced concrete pipes are lowered in the trench, they can be shifted smoothly under the roller unit and joined together.
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