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Turnkey construction pits

Munich
FIZ Research and Innovation Centre building

Munich, Germany / 05.2021 - 09.2021

PORR Special Civil Engineering GmbH excavated the construction pit between May and September 2021 for the construction of a new building at the Research and Innovation Centre (FIZ) in the north of Munich. The scope of work included the construction of the construction pit shoring, including back-anchoring, as well as the implementation of the structural design in collaboration with PORR Special Civil Engineering Planung.

In the front part of the picture is the construction site made of sand and gravel with a yellow construction machine. On the left-hand side is the wall of the neighbouring building. Next to it you can see a grey silo. At the back of the construction site is another piece of construction equipment. There is a white office building on the horizon. A red tipper lorry is driving across the construction site.
© PORR

Facts & Figures

Company

PORR Spezialtiefbau GmbH

Type

Turnkey construction pits

Runtime

05.2021 - 09.2021

Principal
BMW Group

Construction pit for the new building at the Munich Research and Innovation Centre

Excavation shoring with soil-cement wall

The excavation shoring consisted mainly of a soil-cement wall covering an area of approximately 3,100 m², incorporating steel sections and back-anchoring. The soil mixing method involves mixing the existing soil on site with a cement slurry. This creates a soil-cement structure into which the necessary load-bearing and reinforcement elements are subsequently installed. The soil mixing wall reached depths of up to 13.40 m and formed the central element of the excavation shoring.

Supplementary shoring measures

In areas with increased structural requirements, an additional 630 m² of overlapping and back-anchored bored pile walls, as well as approximately 200 m² of spaced pile wall with shotcrete infill, were constructed. Around 1,200 m of grouted anchors were used for the temporary shoring of the construction pit. A closed dewatering system prevented groundwater from entering the construction pit during the runtime.

Integrated planning and Lean Construction Management

The structural engineering work was carried out in collaboration with Stump-Franki Planung. Lean Construction Management was employed to coordinate the construction processes. During regular scheduling and coordination meetings, the individual work stages were agreed upon between the trades involved and the execution processes were presented transparently. This enabled the individual construction phases to be coordinated and the handover points between the trades to be planned.

Foundation for the new building at the FIZ Munich

By constructing the excavation perimeter, installing the anchoring system as well as implementing dewatering measures, Stump-Franki laid the groundwork for the subsequent structural work on the new building at the Munich Research and Innovation Centre. The combination of soil-mixed walls, bored pile walls, grouted anchors as well as dewatering was adapted to the project-specific requirements of the inner-city site.

What ultimately counts in the construction business is successfully completed projects. PORR has many of these.

In the front part of the picture is the construction site made of sand and gravel with a yellow construction machine. On the left-hand side is the wall of the neighbouring building. Next to it you can see a grey silo. At the back of the construction site is another piece of construction equipment. There is a white office building on the horizon. A red tipper lorry is driving across the construction site.
© PORR
View of the finished and rigid construction pit walls with a depth of approx. 2 metres. At the right-hand edge of the picture, a construction machine is creating the back anchoring. The ground consists of gravel, sand and coarse stone with small puddles. At the edge of the excavation pit is a silo as well as a construction container
© PORR