Laboratory tests of pipelines reinforced with close-fit Trolining liner

•Examinations outlined above were run to get knowledge about real load bearing capacity of pipes rehabilitated with close-fit Trolining liners.•Better chances for more comprehensive diagnosis of underground sewer infrastructure reconstructed with close fit Trolining liners.•Basis for debate on the verification of the calculation algorithm used to calculate bearing capacity of the pipes rehabilitated with liners.

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.