Case Study 3

Manhole Structural Repair

Pipe Diameter: 225mm

Connection Diameter: 4 x tap-in connections

Chamber: Material Concrete

Cover: Circular / Heavy / 630mm

Shaft: 600 x 325 x 335mm

Chamber: 1240 x 900mm

Manhole Depth: 1.7m

Use: Foul

Comments:

Infiltration gushing from two points on the manhole chamber wall.

Surface water infiltration from the exterior of both connecting pipelines.

Fouling deposits on chamber walls.

 

Methods of Repair: The chamber area was washed. The infiltration was sealed internally using the concrete injection method. At this stage the surface was relined.

 

Materials Required: Sand power wash, injection pump and grout mixer.

 

Chemicals required: Seal infiltration

 

Before repair works:

 

 

 

After repair works: