What is Manhole Rehabilitation?
Manholes are subject to a wide variety of environmental factors that can lead to issues as small as a minor leaks to large scale structural failures. Replacing a manhole is a time consuming and costly service. In most cases, repairing issues or performing manhole rehabilitation is the most cost effective solution to any problems that might arise and will greatly extend the life of the manhole and surrounding pipeline. There are several common types of manhole rehabilitation that can be utilized depending on the scope of the damage.
Types of Manhole Rehabilitation
While they are generally out of site and out of mind, manholes can be a major source of deterioration among the entire underground utility infrastructure. However, they are also the easiest part to inspect and repair when necessary as they have an already built in access point. Depending on the structural issues within the manhole, there are several directions a manhole rehabilitation service team can take to remedy the situation.
- Grouting – this technique is primarily used in situations where cracks have formed allowing groundwater to begin seeping into an otherwise structurally sound manhole. Grouting will fill any voids and create a watertight seal.
- CIPP Lining – an increasingly popular mode of manhole rehabilitation. In this process, a resin-saturated felt tube made of fiberglass cloth undergoes impregnation, is inverted or pulled into a damaged manhole or pipe before hot water or steam is used to activate (cure) the resin. This creates a seamless replacement lining that should greatly extended the life of the manhole.
- Epoxy Topcoats – a chemical resistant epoxy barrier is sprayed to provide additional protection against harsh elements within a sewer.