[Video] Bauer BG 20 H Rotary Drilling Rig Flyes Over Munich Roofs

In the trendy Glockenbach district, not far from the Munich city center, a new residential building with a two-story underground parking garage is being constructed. One might imagine that this is nothing out of the ordinary, but this project packs a punch: The site is situated in a rear courtyard, where buildings have recently been demolished, and is only accessible via a single house entrance. Material and equipment cannot be transported via a site entrance as is usual, but must instead be lifted into the rear courtyard by crane.

The BG 20 H had to be lifted into the backyard by a truck-mounted crane. Courtesy of: Bauer Group

As part of the inner-city project, Bauer Spezialtiefbau was tasked with the construction of the excavation pit for the residential building by FGF Verwaltungs KG. “A total of 348 piles with lengths between 8 and 13 m are constructed as a pile wall for the retaining structure,” reports Stefan Ferstl, Operations Manager at Bauer Spezialtiefbau.

The work is carried out using the Front-of-Wall (FoW) method. This means that the piles are installed adjacent to the existing buildings. In addition to this, Bauer is responsible for the pit excavation, the single-layer strut for the excavation pit, and for dewatering.


Above the rooftops of Munich’s Glockenbach district. Courtesy of: Bauer Group

Before work could commence, the required material as well as a drilling rig – a Bauer BG 20 H weighing 42 t – needed to be lifted over the adjacent buildings and into the rear courtyard. To be able to realize this at all, the mast of the rig first needed to be dismantled – in total, a BG 20 H generally weighs around 54 t including the mast. A 500 t truck-mounted crane was deployed for the backyard lifting task.

“Our works will take around six weeks; completion of the pit including subcontractor services is scheduled for spring 2021,” concludes Stefan Ferstl.

A total of 348 piles with lengths between 8 and 13 m will be installed as a bored pile wall for the retaining structure using a BG 20 H. Courtesy of: Bauer Group

Source: Bauer Group