grade ring

grade ring

A precast concrete ring at the top of a manhole; used to adjust the top of the manhole so that it is set at the proper angle.
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In a ring architecture, T-Metro provides a standards-based carrier grade ring solution with recovery from network failures in less than 50 milliseconds, providing switch recovery performance equal to SONET at speeds unmatched by competitors.
F-180 can also be used for replacing missing mortar joints in precast manholes or replacing mortar at the grade ring.
he said, "the standard concrete grade ring is placed over the manhole opening.
concrete--not grout--can be placed between the frame and grade rings to eliminate voids creating structural weakness or where moisture could accumulate and freeze causing frost damage which could weaken the structure.
It usually takes four men to lift a concrete grade ring, which can result in possible injury; however, a 6-inch PRO-RING weights only 14 pounds and eliminates that hazard, helping to reduce worker injuries.
Contract Awarded for Concrete Grade Rings & Pre-Cast Manhole Sections
Eull's Manhole Shield incorporates concrete grade rings, underground mortar, masonry shim strips and an impermeable l-and-l barrier in a single package, ensuring that installation is correct the first time and requiring less ongoing maintenance.
The system incorporates concrete grade rings, underground mortar, masonry shim strips and an impermeable barrier, promoting proper installation and reducing routine maintenance.
These existing problems have been directly related through broken concrete, mortar, and brick mortar grade rings.
The seals can also allow for grade change leveling without the need for grade rings, gaskets, bricks or anchor bolts.
An absolute bond seals between frame and grade rings or frame and cone.
When necessary, grade adjustments are made with pressure-testing grade rings.