| 摘要 |
An adjustable manhole cover support, useful in repaving or resurfacing of road for raising the grade of an existing structure like a manhole frame, that holds a circular cover and is capable of fitting frame openings of somewhat varying diameters, is shown. With this cover support one can standardize on a specific, single diameter manhole cover size for a group of manholes that otherwise would call for an inventory of several different cover sizes. The new cover support comprises a base ring for fitting inside the existing receiving structure, the base ring having at least one adjustable joint with a means for changing the base ring periphery, a lateral cover keeper ring that rises from about the level of the top of the base ring and extends above and preferably is substantially concentric with and substantially larger in diameter than the base ring, a plurality of spanners which bridge the distance between thr rings, at least a pair of the spanners connecting the inner ring with the outer ring, the spanners an/or the keeper ring being self-repositionable in the cover support in response to and accommodation of an adjustment in the periphery of the base ring. The inclination of the surface that is to surround the emplaced cover support can be at least partially compensated for by the spanners' upper surfaces being disposed for establishing a stable inclined plane across them on which to rest a manhole cover.
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