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Manhole cover frame installation do's and don'ts

Frame placement

Do Don't
Frame co-incident with edge of chamber opening Frame overhanging edge of chamber
 
Frame placement - Do
 
Frame chamber - Don't 300px

 

Frame support

Do Don't
Frame set back from edge of the chamber but fully supported by chamber Frame set back from edge of the chamber and not fully supported.
Frame support - Do
Frame support - Don't

 

Additional support

Do Don't
Oversize frame exceeding external limits of chamber top but fully supported by the additional structure. Cover support fouling on the chamber top structure
Additional support - Do
Additional support - Don't

 

Bedding mortar thickness

Do Don't
Thickness of bedding mortar between chamber and manhole cover frame is perfect Thickness of bedding mortar between chamber and manhole cover frame too thin
Between 10-50mmm bedding mortar thickness Less than 10mm bedding mortar thickness is not advised
Bedding mortar thickness - Do
Bedding mortar thickness - Don't

 

Bedding mortar encapsulation

Do Don't
Encapsulate flame flange entirely for a robust bedding installation Absence of bedding mortar from top of frame flange
Bedding mortar encapsulation - Do
Bedding mortar encapsulation - Don't

 

Corbelling

Do Don't
Industry standard and compliant structure correctly aligned Corbelling non-compliant to industry standard and CoP
Corbelling - Do
Corbelling - Don't

 

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