Polyurethane coating is widely used in the construction industry to give structural stability and prevent corrosion. Researchers have developed a way to coat manholes with polyurethane film at an early stage of deterioration so that they are structurally sound enough for continued use.
What Are Manholes Made Of?
Manholes are made of reinforced concrete, which is a type of concrete that contains steel rebar or other types of reinforcement. This makes manholes extremely strong and durable, able to withstand the weight of vehicles and loads above ground. Manholes are also designed to be watertight, preventing water from entering and causing damage to the sewer system or leaks into homes and businesses. However, manholes can face significant deterioration over time because of the extreme environments they are in.
Deterioration of Manholes
Manholes are especially prone to degradation over time since they serve as the entrance to the country’s sewage systems. They are exposed to a biochemical process known as Microbial Induced Corrosion in addition to being employed as entry points (MIC). This complicated chemical process happens when wastewater bacteria generate hydrogen sulfide gas, which reacts with the inherent characteristics of concrete to form sulfuric acid, which may quickly destroy a manhole’s structural integrity. Groundwater leaks, sewer line clogs, and sewage gas leaks become more likely as these facilities degrade. More significantly, they become more vulnerable to root infiltration and shifting soil, which may cause more harm.
For more than 200 years, manholes have been used as access points. They were mostly made of brick and mortar until the mid-twentieth century. Since the 1950s, the majority of them have been made of precast concrete, with a 50- to 60-year projected service life. As a result, a substantial number of manholes around the nation are deteriorating and failing. Worse, the 1980 Clean Water Act’s removal of hazardous heavy metals like lead, chromium, mercury, and arsenic from wastewater produced a more conducive habitat for bacteria, speeding up structural deterioration and shortening the service life of many manholes.
Rehabilitation of Manholes
While modern manhole manufacturers have developed structures that are much more resistant to the impact of MIC, wholesale manhole replacement is simply too expensive for many municipalities. Rehabilitation of manholes, on the other hand, offers a cost-effective solution that addresses the immediate needs of deteriorating infrastructure and greatly extends the service life of existing sewer systems.
The process of rehabilitation of manholes involves the application of polymer coatings or cast-in-place liners to reinforce the structural integrity of the manhole. After the manhole surface has been prepared by washing away debris with a high-pressure hose, spray-applied polyurethane lining is used to reinstate structural integrity and provide chemical resistance. The rehabilitation process can extend the service life of a manhole by as much as 50 years and can be performed quickly with minimal disruption to the community.
What Is Sprayroq?
Sprayroq is a company that makes corrosion linings for buildings, plumbing systems, and sewers. They help to provide structural rehabilitation to public and commercial facilities which also includes protection from water damage.
How Sprayroq Benefits Public Sewer Systems
The maintenance of the hundreds of thousands of miles of public sewer lines and lateral lines that link private dwellings to the public sewage system is one of the most difficult tasks confronting municipalities throughout the nation. Every year, between 23,000 and 75,000 sewage overflow occurrences occur in the United States, the majority of which are caused by aging infrastructure, according to the United States Environmental Protection Agency (EPA).
Local governments are anticipated to spend billions of dollars to restore these wastewater infrastructures, requiring city planners to look for cost-effective solutions that would enable them to give the greatest value with their limited resources.
Sprayroq provides corrosion-resistant coatings and linings to cities to help protect their sewer systems from decay.
SprayWall Structural Polyurethane From Sprayroq
For nearly three decades, Sprayroq has been one of the most innovative names in trenchless technology solutions. Their flagship product, SprayWall, is a leading rehabilitation of manholes solution trusted by customers around the world. A self-priming, spray-applied polyurethane lining, SprayWall can be applied in varying thicknesses and needs only 60 minutes to cure enough to accept flow. This quick curing time ensures that a manhole can be returned to service quickly, making it an ideal solution for projects where sewer services cannot be disrupted for a long period of time.
SprayWall creates a continuous, corrosion- and abrasion-resistant surface once sprayed. The inside walls can withstand a lot of damage, minimizing the amount of wear and tear involved with routine maintenance procedures like vacuuming out the manhole. Even if tools or equipment are dumped into the manhole by mistake, the urethane covering will readily survive the impact without causing structural damage.
Designed to add another 50 years of service life to manhole structures, SprayWall has undergone extensive testing to ensure it meets environmental and safety standards. In addition to being 100% VOC-free, it is NSF 61 approved and has proven resistant to a wide variety of chemicals. Easily and quickly applied by a certified technician, SprayWall is one of the most effective and practical solutions for the Rehabilitation of manholes.
“Spectrashield” is a new type of coating that can be added to existing coatings for enhanced aesthetic value. It can be applied to manhole rehabilitation and provides protection against corrosion and water intrusion.
Older sewer pipes connected to a house may be made of Orangeburg pipes. We discuss why they are not the best pipes for this purpose in What is Orangeburg Pipe? Everything You Need to Know.
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