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Underground Karlsruhe Ustrab

 

construction method single-faced walls, cut and cover construction

company: BeMo Tunnelling GmbH

year: 2013 / 2014

description

A mock-up concrete block was constructed at the construction-site of the city-railway in Karlsruhe, in order to test the results of concrete compaction with Mooser pneumatic formwork vibrators. The mock-up block had the dimensions length 5m x width 5m x wall thickness 1m. The pneumatic external vibrators were mounted only at one wall side of the formwork for this block. The concrete was compacted only by use of these external vibrators – internal (poker) vibrators were not used.

In order to simulate the concrete connection to the existing cover of the real construction, some concrete precast elements were installed on top of the Peri Formwork during the test pouring.

Peri Trio panel formwork as well as Peri formwork based on wooden GT24 girders were used for the mock-up test in order to decide about the perfect formwork system for the future concrete pourings on site.

The results of the test were impressive: Both wall sides, front and back side of the concrete block showed identical and excellent concrete surfaces. Drilling cores proofed great concrete compaction along the wall thickness.

The successful concrete compaction resulted in the decision to use Mooser formwork vibrators also for the compaction of the real wall elements – above them a tunnel head wall.

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