At the begin­ning of August, by far the lar­gest under­wa­ter con­crete base in the history of AUGUST REINERS Bau­un­ter­neh­mung GmbH was pro­du­ced. For this pur­pose, around 10,800 m³ of under­wa­ter con­crete was con­ti­nuously pro­ces­sed by a team of 15 pro­fes­sio­nal divers at a depth of 8 m using the con­trac­tor pum­ping method. This cor­re­sponds to the mass of a soc­cer pitch, which is com­ple­tely fil­led with 1.5 m of concrete. 

The con­cre­ting took one week, with 1,500 con­crete mixers being unloa­ded at the con­s­truc­tion site. The site team spent months pre­pa­ring the large con­crete pour in a floo­ded excava­tion pit down to the smal­lest detail. This was the only way to ensure tech­ni­cal suc­cess.
The com­ple­tion of the under­wa­ter con­crete base also marks the start of the shell con­s­truc­tion of the west side of the har­bor rail­way tun­nel of the new A26 free­way route in Ham­burg. In the next step, the ground­wa­ter (40,000 m³) now trap­ped by the under­wa­ter con­crete base will be pum­ped out of the excava­tion pit. After drai­ning and clea­ning, the excava­tion pit will be han­ded over to the con­crete con­s­truc­tion team. 

Com­ple­tion of the entire shell of the tun­nel under the port rail­road is sche­du­led for 2027. The next mile­stone is the relo­ca­tion of the port rail­way line to the first three com­ple­ted tun­nel blocks and is expec­ted to be rea­ched in spring 2025.