Maintenance Holes

Concrete maintenance holes are available in two basic shapes: circular and rectangular. Rectangular structures are discussed in our Utility Chamber and Monobox MH pages. Circular maintenance holes are available in nominal inside diameters of 1200mm, 1500mm, 1800mm, 2400mm, 3000mm, and 3600mm. The standard depth of bury for precast maintenance holes are 10m to the base, but designs for deeper applications or different live load conditions are available. The standard riser section heights are available in 300mm increments. Each circular MH section is supplied with a single offset joint and a pre-lubricated rubber gasket.

  • Access points and pipe junctions in storm and sanitary gravity sewer systems
  • Valve chambers for watermain and forcemains
  • Storm sewer catchbasins and ditch inlets
  • Lift station wet wells
  • Stormwater management structures
  • Sump pits, or underground storage tanks

  • Not as dependent on the pipe-soil interaction for its structural strength, therefore is not as installation sensitive as other MH materials
  • Available in countless configurations, such as prebenched, precast drop structures, and flexible pipe-to-MH connectors

  • Plant Prequalification Program
  • OPSD 700, 1000, and 1100 series
  • CSA 257.4 – Precast Circular Concrete Manhole Sections, Catch Basins, and Fittings
  • OPSS 407 – Construction Specification for Maintenance Hole, Catch Basin, Ditch Inlet, and Valve Chamber Installation
  • OPSS 516 – Construction Specification for Excavating, Backfilling, Compacting for Maintenance Holes, Catch Basins, Ditch Inlets, and Valve Chambers
  • ASTM C478 – Standard Specification for Precast Reinforced Concrete Manhole Sections

Selecting the right MH for your application is easy with the help of our Sales or Engineering staff. Con Cast Pipe has a range of sizes and appurtenances to suit your every need.