TRENCHLESS SEWER rehabmta- tion techniques offer many methods to correct deficient sanitary sewers. Generally, rehabilitation is divided into the piping system and manhole structures. Defects in manholes are typically classified into two groups -structural failures or operation and maintenance (O&M) issues. Structural problems include such things as missing bricks, exposed wire mesh, and bench/invert problems. O&M issues occur when foreign objects such as roots, debris, deposits, infiltration, inflow and encrustations are present. With so many issues to fix, coupled with an ever-expanding variety of products to fix them, it can get confusing. So, in an attempt to clarify, the products and procedures for manhole rehabilitation have been categorized below into four main groups.
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