Standard Manhole Details Drawing

This is a detailed engineering drawing of a manhole chamber used in sewer or drainage systems. The drawing provides a cross-sectional view, showing the construction details and dimensions of the manhole.

Here are the key components identified in the drawing:

Manhole Frame & Cover

• Heavy-duty cover placed at the top for maintenance access.
• Fixed frame set in Class A concrete.

Cone Brick Section

• Tapered brickwork at the top to gradually reduce the manhole diameter.
• Specified to be a minimum of 1 course and a maximum of 3 courses.

Hand Bar

• Steel bars (Ø10 @ 200 C/C and Ø12 @ 200 C/C) for safety and accessibility.

Standard Precast Cylinder Section

• Main vertical shaft with inner diameter of 1200 mm.

Pipes and Connections

• Main sewer pipe entering the manhole.
• Y-junction 45° and 45° bends for directional changes.
• Short pipes and connectors to join the system.

Concrete Works

• Class A concrete for the base and walls.
• Blinding concrete (Class C) at the bottom layer for leveling.
• Benching concrete (Class A) inside the manhole with a slope of 1 in 10 to guide flow.

Dimensions

• Total depth: 3500 mm (3.5 meters).
• Base slab thickness: 150 mm.
• Pipe diameter: 200 mm with 32 mm wall thickness.
• Various other labeled dimensions for structural details.

This type of manhole is commonly used in municipal sewer systems to provide access for inspection, cleaning, and maintenance of underground pipelines.

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