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Rhino Manhole Installation Guidelines
STANDARD
CAST IRON
FRAME & LID
INSTALLATION
Attachment to the storm sewer base
Polyethylene pipe can be welded into the storm sewer base to fit the requirements for each Rhino Manhole on the project.
The 3-foot high storm sewer base can accept a pipe up to 24 inches in diameter. The 4-foot high base can accept pipe up to 36 inches in diameter.
Other types of pipe can be used with Rhino storm sewer bases. This normally requires cutting the opening in the plastic base at the job site; the opening can be cut with a jigsaw, Sawsall® or Rotozip®.
Attachment to the sanitary sewer base
The sanitary sewer base has five inlet plates and one outlet. Each can accept 4 to 12 inch pipe. Gaskets to provide watertight connections from pipe to the base are available from Rhino.
Excavation and bedding
Excavate the hole to at least 6 feet in diameter and 12 inches deeper than the finished elevation of the invert of the Rhino base.
Place 12 inches of half-inch crushed rock or gravel in the bottom of the hole to provide a stable base for the manhole. Compact to 90 percent.
Place the Rhino manhole base on the compacted rock; check for level and elevation of the bottom of the base as well as orientation of the outlets and grade. Connect all pipes to the manhole base.
Backfilling the base
The base should be backfilled with half-inch crushed rock, gravel or sand to depth of at least above the invert of the Rhino manhole. It may be necessary to hold the base in place during backfilling; care should be taken to backfill around the base uniformly. The base should be checked to make sure it is level and at grade. Compaction should be made in 12-inch lifts.
Attaching risers and upper section
Risers and upper section stack on the high density plastic Rhino base. The joint is a tongue-and-groove design made watertight by using Rhino gaskets.
Backfilling the risers and upper section
Rhino manholes can be installed in the traffic right-of-way and can support H-20 live loads when properly installed.
The base must be backfilled with half-inch crushed granular material. Finish backfill can be Class 1 and Class 2 material, up to grade (see note for definition of Class 1 and Class 2 material). This backfill must be placed uniformly in 12-inch lifts and compacted to 90 percent.
Once the base is set and properly backfilled, the riser(s) and upper section can be installed. Crushed stone, gravel or sand MUST be backfilled uniformly around the sections to the full height of the finished manhole in 12 inch lifts, compacted to 90 percent.
Traffic applications require a concrete collar at least 8 inches thick and at least 5 feet square around the manhole neck. A standard cast iron frame and lid should be set on top of the concrete collar. The Rhino manhole neck can be trimmed with a saw to make final grade adjustments. Neither the iron ring and cover nor the concrete collar should rest on the polyethylene neck or neck extension of the Rhino manhole.
Note
Class 1: Angular, 1/2- to 3/4-inch maximum size, well graded crushed stone, coal, slag, cinders or crushed shells. ASTM D-2321 allows the use of 1-1/2-inch maximum size aggregate, but the use of such large sizes is not consistent with the requirements for uniform haunching and embedment, particularly for small pipe. Class 2: Clean, course sands and gravels with maximum particle size of 1/2 to 3/4-inch, including variously graded sands and gravels containing small percentages of fines, generally granular and non-cohesive, either wet or dry. ASTM D-2487 soil types, GW, GP, SW and SP are included.
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