CASE STUDY – Concrete Manholes in Brisbane

Case Study – Concrete Manholes in Brisbane

Substrate

1 x Concrete Manhole used in Trunk Line Sewer, Size = 1050 dia x 2.7m deep + biscuit

Condition

 The manhole was in need of repair due to severe high levels of H2S attack and erosion.

Preparation

The chamber was vented above and below the chamber on the sewer line and then an air mover was used to increase the ventilation and airflow. A high pressure power wash was followed by acid etch, wash down and then dried using the air mover.
Spray ApplicationSpraying took 1.5 hours including the preparation. 1 coat of Epoxy was applied at 6mm using approx 40 gallons of Epoxy resin

Outcome

 Redlands Shire Council were impressed with the outcome, more work followed.
Concrete-Manhole-1

Before; – with the temporary pipe to protect the epoxy spray from live sewer.

 

Concrete-Manhole-1

Condition before spraying

 

Concrete-Manhole-1

Preparation finished and spraying commences

Concrete-Manhole-1

Complete Spray

CASE STUDY: Brick Manhole Chambers

Case Study – Brick Manhole Chambers

Substrate10 x Brick Manhole Chambers
SizeManholes all approx 600mm x 600mm at various depths, ranging from .75m to 2m deep
PurposeDrainage system on chemical plant
ConditionVarious, ranging from a very severe build up of mineral deposits to oil and grease residue and had previously been coated with an unknown material plus minor structural defects.
Repair detailsChemicals were leaking into the water table causing pollution issues with EA. A sealed system was required because the drains had recently been re-lined because a sealed system was required
PreparationWhere required the manhole was isolated using inflatable drain plugs and then high pressure power washed. Previous coating was removed using a scabbler. Mineral build up was removed using a CP9 and scabbler. The oil/grease residue was removed using acetone.
Spray1 coat at 6mm applied
Time Scaleapprox 7 days

 

Brick-Manhole-Chambers-Before

Before

 

Brick-Manhole-Chambers-After

After