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Hamburg, HafenCity

Internal bracing of the underground railway line.
Facts and Figures
Company Stump-Franki Spezialtiefbau GmbH
PrincipalGarbe Immobilien-Projekte GmbH und BG Halbinsulaner
LocationHamburg - Germany
Type Specialist civil engineering
Runtime01.2019 - 12.2020

Construction pit and pile foundation for the Creative Blocks project.

Mixed use in the form of residential and workspaces is planned for the eastern HafenCity on construction sites 82 a+b. The clients awarded the contract for the manufacturing of the entire construction pit and the execution of the pile foundations to Stump-Franki in consortium. As with most of the HafenCity district, the site soil consists of cohesive and non-cohesive infill underlaid with accumulated organic soft soil (clay). Beneath this are load-bearing sands into which the piles of the deep foundations were set.

Back anchoring not possible

The U4 underground railway line runs along the north side of the construction site. The planned shoring consisted of a terminated bored pile wall with concealed bearer supports. Jetcrete was used for the lower section. Owing to the presence of the underground railway line, this could not be back anchored. The shoring was therefore positioned horizontally against the ceiling plate above the first UG and supported to the inside. This process was also used on the eastern side of the site, near the deep foundations of an existing bridge abutment.

An old quay wall onsite

The Versmann Quay and the Baaken Harbour are located to the south of the 82 construction site. In that area the construction pit was constructed with sloped sides.

The construction site also contained the remains of another, old quay wall. The anchors were separated and more widely spaced around this old quay wall. The pile application points for the new quay wall were planned in such a way as to avoid impact on the anchors.

Pile foundations with obstacles

Numerous obstacles impeded the execution of the pile foundations. The soil of the site contained brick walls from former buildings, reinforced concrete elements from the old quay wall and remnants of timber and reinforced concrete existing piles.
The structural work was handed over in October 2019. In spring 2020, the horizontal props were inserted and the remaining works carried out.

Technical data / quantities

Number of piles

506 TVB piles
78 GBP (shoring)

Drilling depth

up to 24m

Pile diameter

61cm and 78cm

Pile load

up to 3,300kN (design)