| 摘要 |
A cover (56) of an existing manhole is raised in elevation to the elevation of roadway resurfacing, for example, by an adapter (20) which is secured to a head ring (40) of the existing manhole. The adapter is such that when it is secured to the head ring, apertures (77-77) of ledges (75-75) of the adapter may be aligned with threaded apertures (59-59) in lugs of the head ring to which the cover had been secured. Spaced above the ledges and extending peripherally above the head ring is a lip (72) for supporting the cover. At ninety degrees to each of the ledges and projecting from the lip is an ear portion (84) to which the cover may be secured. Additional adapters may be secured to the first adapter which has been secured to the head ring prior to subsequent resurfacing operations.
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