Herrenknecht’s E-Power Pipe used for sustainable pipeline and grid construction

During numerous pipeline and grid expansion projects, a large number of obstacles such as existing infrastructure, rivers or protected areas have to be crossed. In December 2024, Herrenknecht handed over the E-Power Pipe machine to Heitkamp Construction Swiss GmbH for grid expansion projects in Germany.

E-Power Pipe is a microtunnelling method, which enables the precise and safe installation of small-diameter pipelines and protective pipes over long distances, at shallow depths if necessary, and within a distance of only 1–2 metres. The method combines proven microtunnelling technology with the subsequent pull of a prefabricated product pipe. Both pressure-resistant and non-pressure-resistant product pipes can be laid quickly, safely and precisely over long distances of up to 2 kilometres.

A jacking frame in the launch pit drives the fully remote-controlled microtunnel boring machine (AVNS350XB with jet pump) forward to the target pit using special temporary steel jacking pipes. Subsequently, the jacking pipes are retracted by the jacking frame while simultaneously pulling in the product pipe and grouting the annular gap. Thus, the borehole remains permanently and securely supported by the machine and the jacking pipes.

“When planning bores, precision is crucial with some very low and some very high overburden. The longest planned route is about 1,600 metres long and it passes through challenging conditions,” says Philipp Kohlschreiber, CEO of HEITKAMP Construction Swiss GmbH. “Herrenknecht is currently the only provider of a suitable technology with E-Power Pipe and is the undisputed market leader in the field of underground drilling technology with extensive expertise.”

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