New construction of the Rhine Bridge from Hard to Fußach
New construction of the Rhine Bridge
The Lake Constance region belongs to the Alpine foothills and is geologically called the Molasse Basin. This region is characterised by cohesiveorganic soils, sandy soil zones and thick lake clays up to 50m deep. Especially in these areas, deep foundations are necessary due to these soil conditions.
According to the geotechnical report, the ground situation is classified as soil classes 3 to 5 (artificial fills, cohesive-organic soil zones, sandy soil zones and sea clays) according to ÖNORM B 2205.
A shallow foundation was therefore ruled out. Based on existing experience with comparable ground conditions, only grouted piles were considered.
22,750 m of TRM 170/9.0 piles were installed with TRM DN 320 grouted pile shoes to support the two main abutments and several bridge piers. A further 13,510 m were installed for the foundations of subways and retaining walls. The piles were designed as grouted compression and alter-nating load (compression/tension) piles. A total of 36,260 m of TRM 170/9.0 piles were installed for the project.
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