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PROTECTING YOUR WORLD

manhole rehabilitation
SEWER COATINGS

what exactly is
manhole rehabilitation?

Manhole rehabilitation is an important part of maintaining the safety and functionality of our sewer systems. This process involves repairing, restoring, and protecting manholes from deterioration due to age or other factors. The goal is to make sure that these structures are structurally sound and able to withstand daily wear-and-tear. In recent years, polyurea has become one of the most popular materials used for manhole rehabilitation as it offers a number of advantages over traditional methods such as concrete or asphalt. In this article we’ll take a look at why polyurea is becoming increasingly popular for manhole rehabilitation projects, the benefits it provides, and how it can help keep your sewers safe and functioning properly.
Manhole Rehab Armorthane

trenchless manhole
rehabilitation techniques

1. Manhole Coating: One of the primary causes for the deterioration of manholes is the corrosion of metal surfaces due to exposure to water, chemicals, and sewer gases. Manhole coating involves the application of a protective layer, generally made of epoxy or polyurethane, onto the exposed surfaces. This coating acts as a barrier, preventing corrosive substances from penetrating the manhole walls. By protecting against corrosion, manhole coating significantly extends the lifespan of the structure and reduces maintenance costs.

2. Grouting: Another prevalent issue in manholes is the infiltration of water, either from the surrounding soil or leaking sewer pipes. This infiltration can lead to various problems, such as soil erosion, foundation instability, and increased risk of collapses. Grouting involves injecting a cement-based or chemical-based material into the surrounding soil or cracks to fill voids and stop water intrusion. It stabilizes the soil, preventing erosion and strengthening the manhole structure, ultimately enhancing its load-bearing capacity.

3. Rehabilitation Liners: When manholes experience internal deterioration, caused by factors like chemical exposure, hydrogen sulfide attack, or physical degradation, traditional repair methods may not be feasible. In such cases, using rehabilitation liners can be an effective solution. These liners are typically made of fiberglass or composite materials and are inserted into the existing manhole to create a new, structurally sound inner layer. This technique not only restores the integrity of the manhole but also prevents future deterioration.

4. Joint Sealants: Manholes consist of multiple precast concrete sections joined together through joints, which are susceptible to deterioration and leaks. Joint sealants are used to fill and seal the gaps between these sections, preventing the infiltration of water, debris, and other foreign materials. By ensuring tight and secure joints, this technique enhances the structural stability of manholes and reduces maintenance needs.