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Manhole Cover Frame Installation Do's and Don'ts

Do's  
Do's Frame Placement

Frame placement

  • Frame co-incident with edge of chamber opening
Do's - Frame support

Frame support

  • Frame set back from edge of chamber but fully supported by chamber
Do's - Additional support

Additional support

  • Oversize frame exceeding external limits of chamber top but fully supported by additional structure
Dos - Bedding mortar thickness

Bedding mortar thickness

  • Thickness of bedding mortar between chamber and manhole cover frame is perfect
  • Between 10-50mm bedding mortar thickness
Do's - Bedding mortar encapsulation

Bedding mortar encapsulation

  • Encapsulate frame flange entirely for a robust bedding installation
Do's - Corbelling

Corbelling

  • Industry Standards and compliant structure correctly aligned

 

Don'ts  
Don'ts - Frame placement

Frame placement

  • Frame overhanging edge of chamber
Don'ts - Frame support

Frame support

  • Frame set back from edge of chamber and not fully supported
Don'ts - Additional support

Additional support

  • Cover support fouling on chamber top structure
Don'ts - Bedding mortar thickness

Bedding mortar thickness

  • Thickness of bedding mortar between chamber and manhole cover frame too thin
  • Less than 10mm bedding mortar thickness is not advised
Don'ts - Bedding mortar encapsulation

Bedding mortar encapsulation

  • Absence of bedding mortar from top of frame flange
Don'ts - Corbelling

Corbelling

  • Corbelling non-compliant to industry Standards and CoP