4 th Tunnel of the Elb; North Ramp, Hamburg, Germany
Reasonable costs through system components: Special hired formwork for tunnel slab carriage
The existing Elb tunnel, commissioned in 1975, with three separate tunnels and six lanes was no longer capable of carrying the present-day volume of traffic of over 140,000 vehicles per day. A fourth, 4.4 km long tunnel will help this situation. Construction contract 3 was for the northern connection to Federal Motorway A 7. The North Ramp had to be constructed by the open construction method. With a total tunnel length of 400 m about 160 m had to be slabbed over to enable construction work to be carried out later.
Taking into account a high number of standard components, PERI designed a formwork concept that represented the basis for the successful completion of the work.
In sections of 20 m in length, two 6.00 m high VARIO units formed the whole length of contract 3. The forces arising from the single-face formwork could be safely carried by SB Brace frames.
2.30 m high VARIO formwork on SKS climbing brackets then followed later for the inclined connecting wall. The formwork could be opened and closed without a crane. Brackets and formwork could be moved in units to save time.
PERI supplied a formwork carriage for the length of 160 m that was constructively based on standard components. The inclined connecting walls and the slab were concreted in one pour with this in sections of 10 m in length. The striking and erecting movements of the formwork were controlled hydraulically. The load transfer from the single-face concreting was taken by horizontal compression braces.
Contractor:
Joint Venture of WIEMER & TRACHTE AG, MEYER & JOHN, PETER GEISLER GmbH
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