Choosing the trenchless renovation methods and trenchless underground methods of pipelines refitting

Trenchless technologies lie in the deposition, fixing or renovation of underground infrastructure with a little or even zero digging operations. Fixing operations are a special case of renovation, when the technical capacity of the pipelines is restored through sealing or local repairs. A sealing up operation lies in filling undug or leaking places with a sealing material or injecting liquid sealing materials inside the pipeline. Thus, external and internal sealing up methods can be distinguished. The world’s technology offers a number of replacement, renovation and sealing up methods, which satisfy branch safety standards. The most frequently used trenchless renovation methods are presented in table 1.