Manholes & Inspection Chambers in Building Construction

While you are Setting up a Drainage System in a building, always have it in mind that you will need to install one or more inspection chambers & Manholes.

Inspection Chambers are a crucial part of any drainage system as they allow for testing, inspection and cleaning of the drainage system.

Manholes and Inspection Chambers are pit in place to serve the same purposes but Manholes are Large, build up with bricks that can even enable a person to physically climb down into the drainage system.

WHEN TO USE AN INSPECTION CHAMBER
  • You should use an inspection chamber whenever a branch pipe joins a main drainage run.
  • You should also use an inspection chamber whenever any drainage pipe changes direction horizontally by more than 30°, or when there is a straight run of more than 22m.
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TYPES OF CHAMBERS
[1] ACCESS CHAMBER

Access Chamber are intended to provide simple access for cursory inspection and access for drain rods or other maintenance equipment. They are not intended to provide access for a maintenance operative and are generally not more than 600mm deep.

[2] ABBREVIATED IC INSPECTION CHAMBER

Abbreviated IC inspection chamber are larger than access chambers, typically a minimum 450mm diameter. Again, they provide access for maintenance equipment, but tend to have more branches/spurs feeding into them and are often up to 1000mm deep.

[3] MANHOLES

Manholes are the largest chambers providing access to a sewer or drain for maintenance equipment, and, in some cases, for operatives to enter the system itself. The minimum internal dimensions of a manhole are 600x900mm and they can be of any depth, although most modern manholes tend to be at least 1 metre deep with inspection chambers used for shallower depths.

PRECAUTION WHILE WORKING ON A MANHOLE

Manholes are exceptionally dangerous places. Noxious gases may be present that can injure and kill. It is most strongly recommended that all work on live sewers is undertaken by drainage specialists who have successfully completed a ‘Confined Spaces’ and/or ‘Sewer Working’ safety course. Properly trained and accredited tradesmen will have certificates to prove their competence. DO NOT TAKE RISKS.

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