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Changes in strength parameters of pipelines rehabilitated with close-fit Trolining liners – numerical analysis based on laboratory tests

Abel T.

Archives of Civil and Mechanical Engineering

2016

Vol. 16, no. 1

30--40

Underground network infrastructure shows that even objects functioning in the third technical condition, according to ATV A127, and subjected to rehabilitation with the use of close-fit trenchless technologies are capable of withstanding external loads. It is necessary to conduct analysis and research regarding the mechanical properties of pipelines strengthened with close-fit liners. Calculations, based on laboratory tests, were carried out using the Finite Element Method and Abaqus software as a computational tool. This paper aims to increase knowledge in the area of the possibility of using close-fit liners for pipelines operating in the second technical condition according to ATV A127. A direct and applicable value of the carried out calculations is to provide knowledge about the real bearing capacity of conduits renewed with close-fit liners, and in particular a Trolining liner. The knowledge gained as a result of research, which was conducted in the previous stage, and calculations can be a basis to undertake a discussion on the selection of the strength parameters of close-fit liners.

Laboratory tests of pipelines reinforced with close-fit Trolining liner

Abel T.

Archives of Civil and Mechanical Engineering

2015

Vol. 15, no. 2

427--435

Examinations outlined above were run to get knowledge about real load bearing capacity of conduits rehabilitated with close-fit liners. The versatility of testing stand constructed allows to model various soil media and to simulate various kinds of loads. This testing stand provides better chances for more comprehensive diagnosis of underground conduit operating conditions not limiting it to its reinforcement problems. Conduits made of various materials could be tested, so new perspectives for research work at Civil Engineering Institute are new broken open. A series of testing carried out to verify the bearing capacity of Trolining liner has enabled determination of bearing capacity of conduit rehabilitated with this sleeve-type technology. Furthermore, it was proved that renovation with Trolining type liners is possible for conduits in very poor technical condition (deflection of about 10%), in order to prolong their operation. A value of direct applicability resulting from these tests is the knowledge of real load bearing capacity of conduits rehabilitated with close-fit liners, and especially the Trolining one.