Geneva Pipe and Precast lined products provide complete corrosion protection for the entire manhole base and sewer systems. Our liners offer versatile design for corrosion resistant, water-tight and maintenance reducing municipal sanitary sewer manholes.
The Geneva Base Liner is a molded, wastewater resistant PP or FRP thermoplastic concrete protective liner system of reinforced polymer with a thickness range from .12” – .20” (3 – 5mm), mechanically bonded with the concrete base structure during the precast concrete process. Encompassing the entire interior configuration and surface of the manhole base in one piece, the base liner provides long-term manhole protection and efficient wastewater transmission.
The bottom of our manhole base has exposed angular aggregate and wire coils for a strong mechanical bond to the concrete. It is cast upside down on a support cone with monolithically poured concrete around the inverted base liner. The one-piece construction of the base liner makes the application safe and easy.
Our lined manhole is formed upside down so no reworking is required; this means quick and safe production with attractive cost savings. Conventional manhole bases, especially those with concrete benching, are subject to attack from aggressive wastewater and will require expensive repair work.
The pipe-specific bell design ensures a water-tight connection between the base and the pipe system, regardless of changes in direction and gradient. The result is a perfect invert to channel alignment every time.
Manufactured in our ASTM-certified Facilities
Manufactured at our plants in the United States, Geneva Lined Manholes provide complete protection from the corrosive effects of oxidizing hydrogen sulfide.
A high-strength mechanical bond with concrete is achieved by using aggregate and steel lattice or similar anchoring systems. Pipe penetrations are molded at the appropriate location during manufacturing. This negates the need to field core and attach ancillary connections later. Installation time and costs are substantially reduced.
Concrete is monolithically poured around the liner while it is supported in an inverted position ensuring the utility of a minimum 4000 P.S.I. monolithic casting. A high-strength mechanical bond between liner and concrete is achieved by way of a well-proven interface consisting of specifically-sized clean aggregate and steel coil/lattice bonded to the bottom of the liner. With vibrated concrete attaching itself to this continuous multi-faceted bonding medium, intruding forces of groundwater backpressure is not of concern.
