The metropolitan railway to Saarbruecken that has been in the planning stages for a long time in Riegelsberg in the Saarland, Germany, is now being constructed.
Due to the extremely restricted space, only a very narrow supporting concrete pump can be used for the concreting work on the track bed. For most of its journey, the track runs directly alongside the busy main street of Riegelsberg.
Approximately 30m of the rail bed's superstructure has been placed with 20m3 of fine concrete (C30/37, grain 0/16mm). This work was undertaken using a PUMI 24-3.67 CS from Cemex Deutschland. Due to the low degree of support (4m in the front and 2.3m in the rear) and the construction site reach of the 24m boom, the Putzmeister truck mixer concrete pump was preferred for deployment.
A fine concrete with a higher degree of rigidity is used for the superstructure of the track bed. Covers protect the rails which have already been laid from concrete splashes.
With such active traffic it is not feasible to block the road with concrete pumps as well.
According to the company, the solution is that the narrow supporting PUMI is more than enough for the route of the new metropolitan railway.
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