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An adjustment riser is disposed between a manhole and a frame embedded in the paved surface of a roadway. The adjustment riser includes an annular concrete base which includes substantially flat top and bottom surfaces. A ridge and a groove are formed on the top and bottom surfaces, respectively, of

An adjustment riser is disposed between a manhole and a frame embedded in the paved surface of a roadway. The adjustment riser includes an annular concrete base which includes substantially flat top and bottom surfaces. A ridge and a groove are formed on the top and bottom surfaces, respectively, of the base to facilitate in the stacking of multiple risers and to prevent water infiltration. The adjustment riser additionally includes a plurality of adjustable support assemblies for supporting the frame. Each support assembly includes a support which extends axially within a corresponding bore formed in the base. Each support includes an enlarged head shaped to support the frame, the vertical position of the head of the support relative to the top surface of the base being continuously adjustable. In this manner, the adjustable nature of each support enables riser to hold the frame in its proper orientation relative to the paved surface.

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1. An adjustment riser for a frame, said adjustment riser comprising:(a) a base, said base including a top surface and a bottom surface, said base being shaped to define an central opening, wherein a bore is formed in said base, the bore extending down from the top surface of the base, and(b) a firs

1. An adjustment riser for a frame, said adjustment riser comprising:(a) a base, said base including a top surface and a bottom surface, said base being shaped to define an central opening, wherein a bore is formed in said base, the bore extending down from the top surface of the base, and(b) a first adjustable support assembly coupled to said base, said first adjustable support assembly comprising(i) a support, said support including an elongated, threaded stem and a head, said head being disposed at one end of said elongated, threaded stem and being adapted to at least partially support said frame, the elongated, threaded stem being sized and shaped to extend axially within the bore, with the head disposed above the top surface of the base;(ii) a first threaded nut wedged within the bore, the first threaded nut being sized and shaped to threadingly receive the elongated threaded stem of the support; and(iii) a second threaded nut, said second threaded nut being axially mounted on the elongated threaded stem of the support above the top surface of the base.2. The adjustment riser of claim 1 wherein the vertical position of the head of the support relative to the top surface of the base is adjustable.3. The adjustment riser of claim 1 wherein the support is capable of substantially continuous, linear displacement within the bore.4. The adjustment riser of claim 1 wherein the top and bottom surfaces of said base are substantially flat.5. The adjustment riser of claim 1 wherein said base is constructed out of a concrete material.6. The adjustment riser of claim 1 wherein said base is annular in shape.7. The adjustment riser of claim 1 wherein a ridge is formed on the top surface of said base and a groove is formed on the bottom surface of said base, said groove being complementarily shaped and positioned relative to said ridge so that a plurality of bases may be stacked upon one another, with the ridge of a lower base being received within the groove of an upper base.8. The adjustment riser of claim 6 wherein said base has an outer diameter of approximately 50 inches, an inner diameter of approximately 26 inches and a height of approximately 3.5?5.5 inches.9. An adjustment riser for a frame, said adjustment riser comprising:(a) a base, said base including a top surface and a bottom surface, said base being shaped to define an central opening, wherein a bore is formed in said base, the bore extending down from the top surface of the base; and(b) a first adjustable support assembly coupled to said base, said first adjustable support assembly comprising a support adapted for vertical displacement relative to said base, said support including an elongated, threaded stem and a head, said head being formed on one end of said elongated, threaded stem and being adapted to at least partially support said frame, the vertical position of the head of the support relative to the top surface of the base being adjustable, wherein the elongated, threaded stem is sized and shaped to extend axially within the bore for substantially continuous, linear displacement within the bore, with the head disposed above the top surface of the base.10. The adjustment riser of claim 9 wherein a first threaded nut is wedged within the bore, the nut being sized and shaped to threadingly receive the stem of the support.11. The adjustment riser of claim 10 further comprising a washer and a second threaded nut, the washer and the second threaded nut being axially mounted on the stem of the support above the top surface of the base.12. The adjustment riser of claim 11 wherein the washer and the second threaded nut can be used to limit the downward displacement of the support relative to said base.13. An adjustment riser for a frame, said adjustment riser comprising:(a) a base, said base including a top surface and a bottom surface, a ridge being formed on the top surface of said base, a groove being formed on the bottom surface of said base, wherein the groove is sized and shaped to fittingly receive the ridge to provide a water-tight seal therebetween, said base being shaped to define an central opening, and(b) a first adjustable support assembly coupled to said base, said first adjustable support assembly comprising a support adapted for vertical displacement relative to said base.14. A manhole assembly comprising:(a) a manhole;(b) a manhole frame positioned over said manhole, said manhole frame comprising an annular ring and a platform extending radially outwardly from said annular ring; and(c) an adjustment riser positioned between said manhole and said manhole frame, said adjustment riser comprising:(i) a base positioned over said manhole, said base including a top surface and a bottom surface, said base being shaped to define an central opening, and(ii) a first adjustable support assembly coupled to said base, said first adjustable support assembly comprising a first support adapted for adjustable vertical displacement relative to said base, said manhole frame being supported by said first support.15. The manhole assembly as claimed in claim 14 wherein said adjustment riser further comprises a second adjustable support assembly coupled to said base, said second adjustable support assembly comprising a second support adapted for adjustable vertical displacement relative to said base, said manhole frame also being supported by said second support.16. The manhole assembly as claimed in claim 15 further comprising a manhole cover removably mountable within said manhole frame.17. The manhole assembly as claimed in claim 14 wherein said manhole is a pre-cast structure having a generally cylindrical shape provided with a central opening.18. The manhole assembly as claimed in claim 14 wherein said base includes a bore extending downwardly from the top surface thereof and wherein said first adjustable support assembly further comprises a first threaded nut wedged within said bore, said first support including an elongated, threaded stem and a head, said head being disposed at one end of said elongated, threaded stem and being adapted to at least partially support said manhole frame, the elongated, threaded stem being sized and shaped to extend axially within the bore and to threadingly engage said first threaded nut, with the head disposed above the top surface of the base.