Benefits and Installation

Manhole Inserts (also referred to a Manhole Liners) provides a structural repair to manholes that have experienced corrosion or deterioration due to aggressive environments. These liners are designed to fit inside deteriorated manholes. Diameters of the manhole liners are sized 6-inches smaller than the host manhole diameter.

Prior to installing the manhole liner, the installer cuts the liner to the proper length and to accommodate all pipe penetrations, as required. Installations typically involve removing the cone section of the host manhole and lowering the manhole liner until it comes to rest on the bench of the host manhole. After insertion, the manhole liner is braced in position, then grouted into place. The portion of the manhole liner that extends above the host manhole riser is, then, backfilled with suitable granular material. The manhole is then brought to grade using grade adjustment rings and ring & cover. Manhole liners are designed to withstand all structural loads (i.e. soil, hydrostatic, H20 traffic) as with direct bury FRP manholes without the aid of the host manhole or annular grout.