… is faced with very stringent requirements regarding national standards and application guidelines, safety aspects, system durability, exposure and stress conditions, demanding construction methods and sequences. In view to the overall system performance and the total cost management – the application itself in combination with quality, logistics, the appropriate choice of material and systems components, in-time approach and a collaborative hand-in-hand of the involved partners are the keys of success.

With our team of regularly trained welding specialists, we are one of the most experienced and productive liner installers in the industry. We have been successfully active in different sealing applications since the 1960s and are constantly developing our expertise.

Today, operators request a service life for underground structures of 100+ years, but a lack of water tightness severely reduces the long-term durability of a tunnel structure and badly affects its planned use, as water ingress results in physical attack and deterioration of the concrete. Expensive repair works, damage, operational downtime, and future maintenance are the results.

Infrastructure projects are increasingly being built under extreme environmental conditions, for example in urban areas with logistical challenges or with soil pollution exposures, or in alpine regions with high overlays, extreme groundwater pressures (>100m waterhead) or with high permanent temperatures. Appropriate care is required for the sealing system, but also about the corresponding control mechanisms, acceptance criteria, leak detection and repair possibilities.

In this way, we combine formal knowledge with practical experience on the construction site and taking advantage of synergistic effects.

The special water & frost protection system for light rail constructions consists of a PVC-coated polyester reinforced cloth, both sides acrylic lacquered and suspended in steel pipe arches which are secured with rock bolts.

The exposed fabric is categorized as self-extinguishing and with a low smoke production rate, tested according to ISO 9705 or ISO 11925-2 or other relevant standards. It complies for example with tunnel classes A/B in accordance with the Norwegian Public Roads Administration's requirements in manual N500/Table 4.4.

Automatic steered drilling operations allows for precise installation of technical bolts (tolerance <3cm), which enable the next contractor to set the electrification for railways in an efficient way taking advantage of synergistic effects.

The construction itself is an economical solution, low in maintenance and with a sustainable low carbon footprint in comparison to standard structures with shotcrete as inner liner.