Abstract
In sewer pipeline rehabilitation, it is a common practice to renovate the aging pipe as a composite pipe to resist external forces by forming a reinforcing liner with grouted mortar in sewer pipe. Because the renovated sewer pipe features having old pipe and the special structural form of composite pipe, the structural design is difficult to apply the existing design approach for a common underground structures directly. A design method of composite pipe was developed and has been applied in sewer pipe rehabilitation practice, which applies the nonlinear finite element analysis method and the limit state design concept. In this paper, the design method for sewer pipe renovation is introduced, as well as its verification experiments. In addition, the efect of pre-load acting on the existing pipe is investigated experimentally and numerically, and the validation of the proposed design method is clarifled.
