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Installation Instructions
Underground Enclosures
1- Underground enclosures can be delivered to the site on any
construction maintenance vehicle. Easily handled by hand or boom
truck for unloading.
4- Install temporary supports in the interior of the underground
enclosure to provide greater lateral rigidity. The number of supports
varies depending of the size of Underground Enclosure. Small
enclosures 1730 and smaller do not need additional supports.
2- Mark location and begin excavation, prepare excavation so there
is room for at least 6” of bedding material. Depth of excavation =
Box height + 6”.
3- Place a suitable bedding material (compacted pea gravel or
crushed rock) beneath the enclosure and level it to ensure that the
enclosure is well supported beneath its walls.
Install wire mesh on the level bedding material. Wire mesh is
utilized to control pest and rodents preventing possible destruction
of wire after installation.
On larger enclosures, utilize a boom to install enclosure into the
excavated hole.
5- Place a temporary or the actual cover on the enclosure before
backfilling uniformly on all four sides. Backfill to grade level.
Compact every 6” to ensure well compacted backfill. A mechanical
tamping device as shown or alternative hand operated mechanical
devices should be used. Do not use a tire or shovel of a backhoe
as tamping tools!
3/10/06
* Be sure that the soil or pavement is to grade level before allowing
vehicles in the vicinity of the enclosure.
301 Ziegler Drive, Grayslake, IL 60030
Phone: 847-548-8700
Fax: 847-548-8755
Website: www.harger.com
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