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Finding and Rehabilitating Manholes

Manholes are a significant part of a drainage system which provide clear access points to underground pipes, letting CCTV surveys done above ground. This makes it possible to inspect pipes without doing intrusive excavation work. Manhole rehabilitation is important to ensure the integrity of its structures. Here is a guide that gives you the information you need:

Finding Buried Manholes

Certainly, there is always an access point. It is just important to determine their location. Here are some ways to look for a manhole cover.

  • Talk to a local water provider. Your local water board may have maps of the drainage system in your area. The map can give you insights into where the access points might be.
  • Utilize a metal detector. A buried manhole might be located a few inches below the surface. Thus, you can use a metal detector to find the manhole. The detector checks your tarmac or garden for signs of entry. But, you won’t be able to depend on your detector for non-metal or stone manhole covers.
  • Check the property of your neighbor. If you have a neighbor who owns the same construction as yours, this means that both of your buildings were made in mirror of each other and that you might have the same chamber. Thus, the chamber might on the property’s front boundary line.

  • Use a road pin. A road pin is a long metal point which can be used for poking deep into the ground and seeing if there is resistance. This tool works for both stone and metal manholes.
  • Enlist a professional drainage team. In case you cannot find the manhole on your own, it is time to contact drainage professionals to find it for you.

Manhole Rehabilitation

Once your manhole is found and you decide it needs rehabilitation, here are some options available for you:

  • Using high-strength formulations. This manhole rehab involves using products blended specifically for the job. The specific, high-strength formulation lets a monolithic one pass spray application to restore your manhole’s structural integrity and offers a permanent seal against corrosion.
  • Using epoxies. A range of epoxies can be sprayed on to achieve a specific wet-film thickness on overhang or vertical surfaces without sagging. These epoxies can be altered to meet certain flexural strength and modulus.

  • Sealing the chimney. This involves using a monolithic, fast-cure coating which forms a tight barrier that links the frame to the other parts of the manhole. The coating is resistant to corrosion necessary to protect open storm inlets from winter salts which can deteriorate concrete rings.

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