Bus station wellingholzhausen, Germany case study
Use of Combigrid under the bearing layer
The old bus station in front of the school in Wellingholzhausen, Germany needed to undergo repair. The very weak subsoil caused to the growing traffic settlements in several areas. Additionally the subsoil and the bearing layer had an insufficient filter stability, which caused an intermixing of the soils and a reduction of the frost resistance of the bearing layer. The use of a needlepunched nonwoven geotextile would prevent the intermixing but could not prevent the settlements, caused by heavy traffic.
For the reason the designer and owner decided to use a composite product which fulfills all functions: separation, filtration and reinforcement. After the investigation of the necessary characteristics it was decided to use Combigrid 30/30 Q1/151 GRK3. This polypropylene product has a biaxial tensile strength of 30 kN/m² and a robust needlepunched Secutex nonwoven geotextile integrated between the rigid welded cross-laid reinforcing bars.
With this production technology a robust composite product is manufactured where the all necessary functions (separation, filtration and reinforcement) are integrated into one product. This results in a long lasting product with an efficient performance and allows a cost effective installation.
Year of construction: July 2003
City / Country: Melle, Wellingholzhausen, Germany
Combigrid® 30/30 Q1/151GRK3 1.187,5sqm