Vacuum Microtunnelling: Creating a New Trenchless Horizon

Abstract

Vacuum microtunnelling is reshaping the future of pipeline installation. Traditionally, trenchless methods have been reserved for specialist crossings, while open cut dominated broader pipeline works. However, advances in systems like AdaptX and modified AXIS machines — which combine the use of vacuum extraction to create high-performance microtunnelling — are now tipping the scales. This paper explores how vacuum microtunnelling technology has evolved and is now expanding the capabilities of trenchless technology, delivering cost competitiveness with open cut at depths beyond five metres in greenfield environments, and at even shallower depths where excavation complexity increases, as is typically the case in urban settings. It highlights how trenchless construction can now offer superior accuracy, speed, and minimal ground disruption across a wider range of projects. Drawing on field data, equipment testing, and project comparisons, the paper demonstrates why trenchless methods should increasingly become the default choice for gravity sewer pipeline installation. It also examines how this shift is giving contractors greater confidence to invest in advanced trenchless equipment, knowing that trenchless construction will capture a growing share of future infrastructure work. By embracing vacuum microtunnelling, the industry can deliver better outcomes with less environmental and community impact. As specifications and procurement frameworks incorporate recent performance data, the share of trenchless installations is likely to grow. This paper outlines the evidence to support that transition with confidence.

Techniques