Prior to excavation, all buried utilities should be located. Excavations
should be made with a moderate clearance around the installed structure.
More space should be provided, as needed, to comply with construction
Excavated material should be stockpiled a sufficient distance from
the excavation or as per Consulting Engineer so as to not impair the
movement of the installation equipment.
Bedding material should be provided on a site specific basis with
careful attention to Consultants recommendations and local municipal
standards. To provide a uniform bearing surface and to ensure that
the structure will not be subject to adverse settlement, a bedding
of 150mm (6") of 20mm to 25mm (3/4" to 1") stone is
generally sufficient. After placing the stone, it must be compacted
and levelled. Special attention should be made that there are no large
stones or rocks that could cause pressure points under the bottom
of the installed structure.
Sites with silty soils, high water tables or other "poor"
bearing characteristics must have specially designed bedding or bearing
surfaces. In the event of excess excavation, any backfill to be replaced
should be granular and well compacted.
Box Manholes should only be lifted at the installed lift points. A
lifting harness incorporating cable or chains and spreader bars should
Care must be taken with joint seals on box manholes. High quality
preformed joint seals must be placed on dry, carefully cleaned surfaces,
free of sand and grit, at the structure's joint. Seals shall meet
minimum compression and other installation requirements as prescribed
by the seal manufacturer. Box sections should be allowed to settle
on joints before backfilling.
Structures should be evenly backfilled in equal, compacted lifts.
Water should be pumped out of the hole to prevent floatation until
the structure is backfilled. Backfilled material should consist of
compacted granulars or as prescribed by the Engineer or contract documents.
All products are designed to meet specific needs. Therefore, an Anchor
representative should be consulted to verify that the product you
have chosen is best suited for your application.