Low-emission power: Our RTG eRG 19 T hybrid sets new standards in its first use

BAUER Spezialtiefbau GmbH, in cooperation with RTG Rammtechnik GmbH, relies on innovative technologies for the 32,000 m² Port ONE Berlin office project that is executed by M-Port Optima Office Center GmbH. Bauer Spezialtiefbau has been constructing the excavation pit and foundations for the new office and commercial building since November 2022. The order: construction of an impermeable excavation pit to create space for underground garages and equipment rooms on the basement levels.

The eRG 19 T hybrid, the newly developed pile driver with hybrid powertrain from RTG Rammtechnik GmbH, is being used here for the first time. “By using the new eRG 19 T hybrid, we demonstrate that construction sites can be efficient as well as quiet and low on emissions”, emphasizes project manager Lars Heilfort.

Over a total of two construction phases, a combination of Mixed-in-Place method (MIP), a pile wall and an LWS silicate gel base which was developed by Bauer is used. Initially, contaminated soil was replaced and foundation piles were constructed to increase load-bearing capacity. Upon completion of the excavation wall, vibration drilling with the eRG 19 T hybrid was carried out to specified grid spacing. These were then filled with insulation, grout pipes with valves were installed and silicate gel injected to create a stable sealing horizon. This way, the excavation pit stays dry and is ready for the subsequent specialist foundation engineering works.

The innovative drive combines the power of a 430-kW diesel engine with the precision of an 88-kW electric motor (max. mains connection: 125 A). The unique combination of the two drives makes it possible to keep efficiency at a consistently high level despite the stringent emission requirements at Friedrich-Krause-Ufer. The diesel engine works at reduced capacity, aided by the supporting electric motor, resulting in a significant reduction in both CO₂ emissions as well as noise levels.

The eRG 19 T hybrid doesn’t just score highly because of its quiet operation but also because of its versatility. With its impressive performance capacity, it masters even demanding impact driving tasks of the next higher equipment group without any problems. But that’s just the start: The electric motor flexibly takes on auxiliary work – efficiently and customer-fit. 

Another highlight of the eRG 19 T hybrid is its modular design. The hybrid attachment at the rear contains all electronic components while the electric motor is easy to service with its integration into the quadruple transfer case at the upper carriage. Important data such as electricity consumption and performance can be checked at any time via the driver display. In addition, the maximum connected mains load can be adjusted directly in the operator's cab, depending on availability on site. The elevates flexibility to a whole new level.