Compared with invasive construction, keyhole refurbishment is significantly less costly. Installing a resin-coated fibre hose in existing piping does not require as many members of staff, it significantly cuts the time a diversion of waste water is necessary during construction and there are no downstream costs to regenerate the road surface.
Refurbishment projects are generally approached at select points within the sewage network, like a minimally invasive procedure. Life at surface level continues almost as usual during keyhole refurbishment – good news for commuters, traders and council representatives.
Pipes and sewage from a single source: cutting-edge refurbishment methods can create continuous structures across long distances without the need for joints. They will consequently not leak and are protected from root damage.
Depending on the framework conditions, keyhole refurbishment procedures take as little as a single day. As a result, they are ideal for urgent construction measures where roads, pedestrianised zones or parks must be conserved.
Keyhole refurbishment procedures are amongst the most CO2 -friendly technologies in civil engineering. They can reduce emissions by approximately 80 to 85% compared with open procedures since excavated materials, equipment use and transport needs are cut almost to zero.
Thanks to modern refurbishment methods it is also possible to reach pipe systems that would not be accessible using conventional methods – for instance under bodies of water, housing or in nature reserves. In addition, keyhole procedures are also suitable for challenging conditions, such as arches and differences in altitude. We also provide other refurbishment methods for major, special-purpose as well as oval profiles in addition to hose linings.
Keyhole refurbishment methods were established throughout Germany more than 30 years ago and have been common throughout Europe for half a century. Depreciation periods of 50 years are usually specified for cutting-edge refurbishment technologies – the expected service life is much longer.
Sewage refurbishments have long since become an established branch of civil engineering and no longer represent a specific niche within the industry. A growing part of sewage networks and systems are maintained using cutting-edge refurbishment procedures. Throughout Germany a host of experienced engineers, implementing companies and test laboratories are available to sewage network operators and council clients as trusted partners.
The resins used as part of refurbishments are chlorine-free (non-halogenated) hydrocarbon substances. Once they have fully cured they do not react with the environment. This is verified as part of standard laboratory tests run during refurbishment projects. The long, expected service life will also make recycling less of an issue. Hose linings can easily be thermally recycled. The calorific value of applied resins corresponds to that of crude oil.