29. The tunnel is considered to be a MultiPlate structure which is one of the
products of the manufacturer polish company ViaCon.
MultiPlate MP200 structures are approved by most of EUROPEAN ROAD
AND RAILWAYS ADMINISTRATIONS AND NATIONAL STANDARDS.
They are manufactured in accordance to european standards. This product
has CE mark "European Conformity".
Steel used for MultiPlate MP200 is produced in accordance with EN
10025:2000, PN-EN 10027-1:1997 and PN-EN 10113:1998.
Minimum yield strength 235 N/mm2.
Soil - structure interaction results in deformations of structure during
backfilling. Backfill material (sand – gravel mix) should be of 0-45 mm
aggregate. Proper preparation and compaction of soil (to 98% standard
Proctor density) and assembly of a structure acc. to producer
recommendations are the most important elements.