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AFTER TUNNEL BREAKTHROUGH, CONCRETING IN THE ROTHENSTEIN TUNNEL

After the Rothen­stein tun­nel was cut through at the begin­ning of the year, the inte­rior work and thus the con­s­truc­tion of the per­ma­nent rein­forced con­crete tube is curr­ently under­way. As part of this, the sou­thern por­tal block of the 385 m long tun­nel was con­cre­ted on June 10, 2021. This also marks the end of the semi-open con­s­truc­tion method, which is neces­sary due to the abra­sive cut of the rock face and gives the pro­ject its uni­que cha­rac­te­ristics.
The four vault blocks of the semi-open con­s­truc­tion method, squeezed bet­ween the rail­road line and the rock for­ma­tion, repre­sent the most chal­len­ging sec­tion of the ongo­ing rein­forced con­crete work. The blocks each con­tain bet­ween 40 and 50 tons of rein­force­ment and 230 to 280 m³ of con­crete, depen­ding on the degree of the cut.
Fol­lo­wing the con­cre­ting of the por­tal block on 10 June 2021, during which 256 m³ of con­crete was pla­ced in around 14 hours, the con­cre­ting of the two inter­me­diate blocks of the pil­grim step method is still pen­ding. ALFRED KUNZ’s share of the work will be com­ple­ted at the begin­ning of August and the struc­ture will be han­ded over to the road con­s­truc­tion team.
The newly built bypass for Rothen­stein is sche­du­led to go into ope­ra­tion in 2022.