Steep Drive in an Urban Environment
The Civil Engineering Office of the City of Zurich planned the construction of a combined sewer and a streamwater channel along Weihersteig in Zurich-Wipkingen. Both channels were to be installed within a pre-installed, trenchless, shared casing pipe.
Project Goal
The objective was to install the two channels using a trenchless method within a shared casing pipe over a length of approximately 100 meters. The drive started with an incline (slope 18.75%) at the starting shaft and followed Weihersteig to the receiving shaft. The internal diameter of the casing pipe was DN = 1,600 mm, with an external diameter of DA = 1,960 mm. The alignment had an infinite horizontal radius as well as an infinite vertical radius.
How we executed it
A hydraulic joint of type JC250 was used as a pressure transmission ring. The MSS monitoring system collected all possible project data and provided a global overview for all parties involved. The multifunctional, autonomous tunneling machine “CT Rover” was used to carry out the annular space backfilling.
Results
The MSS system represented an absolute added value for this impressive drive. Finally, 33 joints were injected using the JCGrout system to passivate the sleeves, thereby ensuring a longer service life of the joint connections.
