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Construction pit and jet-grouted underpinning for lot L137, Munich

Facts and Figures
Company PORR Spezialtiefbau GmbH
Principal Lang Lang Lang GbR, Munich
Location Munich - Germany
Type Construction pits, Planning
Runtime 06.2022 - 09.2022

Produced using vibration-free, low-noise methods

Between June and September 2022, the Munich branch of PORR Spezialtiefbau was commissioned by Lang Lang Lang Objekte und Projekte to create a construction pit measuring around 500m2 and 5.2m deep in a vacant site between two existing buildings at Landsberger Strasse 137. Three sides of the temporary construction pit system were made with anchored jet-grouted bodies, while the side facing the road was made with anchored soldier pile shoring and jetcrete bracing. The adjacent buildings were secured against settlement with jet-grouted underpinnings. PORR was responsible for planning the specialist civil engineering work.  

Every inch of usable space counts 

A modern residential and commercial building with subtle façade greening will replace a three-storey mansard roof building between two existing buildings. The building height has been brought into line with that of the neighbouring buildings to create a harmonious overall impression. “Building land is at a premium in Munich’s West End, so it was important to make use of every centimetre when creating the construction pit,” says project manager Daniel Mayer.  

Processes in line with the DGNB guidelines for sustainable building sites 

Like every inner-city construction project, the construction pit for lot L137 presented its own unique challenges: particular attention had to be paid to fixtures embedded in the ground during the excavation and specialist civil engineering work. The site set-up area was only 30m2, which made organising the construction process especially tricky. The team used only small, compact equipment. “We also regularly reviewed our processes to see if they were in line with the DGNB certification for sustainable building sites. We kept disruption to local residents to a minimum by using methods that generate low noise and zero vibrations,” adds Mayer.