Uneven manhole covers in bituminous pavements which have subsided due to traffic impact.
• ADVANTAGES
Watertight, flexible transition between bituminous pavement and rigid steel manhole covers. Shockabsorbing
due to the flexibility of the repair materials. Accommodation of thermal and physical movement. Attenuates impact
loads which cause damage and create noise nuisance.
• WORK METHOD
A saw cut is made some 100-200 mm around the cover to encompass all deterioration. The existing materials are broken
out using light power tools ensuring minimal damage to the sub-base. The manhole frame is reset to correct level
using a rapid cure mortar. After thoroughly cleaning and heating the outer edge of the manhole frame and the vertical
bituminous surfaces with Klaruw's purpose designed Superjet hot air lance, a hot sealant primer is applied. The void
is then filled with a mixture of single size aggregate and flexible sealant. The reinstatement is then compacted with
either a vibrating roller or plate. Finally the repair is completed by applying a thin sealing coat on which calcined
bauxite is spread.
Uneven manhole covers in bituminous pavements which have subsided due to traffic impact.
Watertight, flexible transition between bituminous pavement and rigid steel manhole covers. Shockabsorbing
due to the flexibility of the repair materials. Accommodation of thermal and physical movement. Attenuates impact
loads which cause damage and create noise nuisance.
A saw cut is made some 100-200 mm around the cover to encompass all deterioration. The existing materials are broken
out using light power tools ensuring minimal damage to the sub-base. The manhole frame is reset to correct level
using a rapid cure mortar. After thoroughly cleaning and heating the outer edge of the manhole frame and the vertical
bituminous surfaces with Klaruw's purpose designed Superjet hot air lance, a hot sealant primer is applied. The void
is then filled with a mixture of single size aggregate and flexible sealant. The reinstatement is then compacted with
either a vibrating roller or plate. Finally the repair is completed by applying a thin sealing coat on which calcined
bauxite is spread.