Composite Manhole Inserts

Benefits and Installation

Manhole Inserts (also referred to a Manhole Liners) provide 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

Strong and Lasting Construction

Our fiberglass manhole liners meet or exceed all ASTM requirements for fiberglass manholes. These fiberglass manhole liners are designed to withstand the rigid requirements of ASTM Specification D3753 for glass fiber-reinforced plastic (FRP) manholes. In addition to the ASTM standards, our fiberglass manhole liners meet H-20 load requirements. Our products are engineered to provide you with long and trouble-free service.

One Piece Design

The one piece design of fiberglass manhole liners makes installation economical and easy. Our fiberglass liners are light-weight which eliminates the need for heavy equipment on the job site. Installation is less time consuming because there is only one piece to install. In a short time, an old decaying manhole can be easily transformed into a newly lined fiberglass manhole.