In The Area Of The Planned Sole Renovation, The Sole Is To Be Broken Out Up To A Depth Of Around 30-40 Cm In The Pilgrimage Step Process And An Approximately 20-30 Cm Thick Concrete Layer Is Introduced In The Immediate Connection (Production Of The Ring Closure). The Inner Shell Of The Sole Is To Be Produced By An Approximately 8 Cm Strongly Profiled Spray Concrete Shell. Furthermore, Renovation Work Is Carried Out Throughout The Tunnel Course (Rubbing From Outlets, Fillings Of The Rough Sole). The Railings And Grids Are Renewed In The Water Lock.
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