Failure of Joints Between Manholes and Sewer Pipes Due to Live Loads

摘要

It is considered that failure of joints between manholes and sewer pipes laid under roads is caused by repeated live traffic loads transferred from the road surface to sewer pipes through manholes. Though various states of the road around manholes cause complicated waveforms of repeated loads, there have been few basic data with regard to the failure properties of joints between manholes and sewer pipes subjected to repeated live loads having different waveforms. The authors conducted model experiments using two types of waveforms, sinusoidal and trapezoidal, with other parameters being the method of connecting manholes and sewer pipes, method of laying manholes and overburden pressure on sewer pipes. As a result, different waveforms of repeated live loads were found to lead to different failure modes of manhole-sewer pipe joints.