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  The role of trenchless methods for underground cables and future energy supply

  The development of renewable energies and the construction of a sustainable power grid are the challenges for future energy supply. Due to the public environmental awareness, smart installation methods are required for fast and safe construction with minimal impact on surroundings. There are three major application fields for trenchless technologies in transmission grid construction: the onshore connection of offshore windfarms, cross-country installations of medium and high voltage cables and inner-city cable tunnels. Furthermore, trenchless methods play a key role when obstacles like water or traffic ways have to be crossed. Proven tunnelling and pipeline methods are used to install steel casings, plastic cable ducts or concrete pipe jacked microtunnels. Small diameter segment lining tunnels of 3 to 3.5 meters inner diameter are currently considered in various projects all over Europe due to the high flexibility in alignment and drive length. Nevertheless, latest safety regulations have tightened requirements regarding machine diameter and accessibility. Thus, large diameter pipe jacking can represent an alternative where applicable. In order to install high-voltage cables separately underground with minimal overburden and high precision over long distances, the two-stage E-Power Pipe® technology was developed in addition to already existing technologies. This paper will share the latest experience from various European cable projects with their different trenchless solutions.

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