초록 ▼

A multipiece prefabricated manhole assembly and method of making same. The manhole assembly is formed from a cured mixture of a polyester and fiberglass that may have the components thereof wholly or partially assembled in the field to rest on a manhole foundation to provide a manhole structure that

A multipiece prefabricated manhole assembly and method of making same. The manhole assembly is formed from a cured mixture of a polyester and fiberglass that may have the components thereof wholly or partially assembled in the field to rest on a manhole foundation to provide a manhole structure that is dimensionally stable and one that is substantially impervious to the corrosive action of sewage and gases emanating from the latter such as hydrogen sulphide, methane and the like.

대표청구항 ▼

In combination with a plurality of longitudinally spaced manhole foundations located at the bottom of a plurality of excavations, said manhole foundations each having a flat upper horizontal surface from which a plurality of circumferentially spaced stud bolts extends upwardly, said manhole foundati

In combination with a plurality of longitudinally spaced manhole foundations located at the bottom of a plurality of excavations, said manhole foundations each having a flat upper horizontal surface from which a plurality of circumferentially spaced stud bolts extends upwardly, said manhole foundations having passages formed therein that communicate with sloping sections of pipe that extend between said manhole foundations, a plurality of multi-piece prefabricated manhole components formed from a cured mixture of a polyester resin and fiberglass that are at least partially assembled in said excavations to define dimensionally stable manhole structures that rest on said foundations and extend upwardly therefrom to a traffic cover located at street grade, each of said manhole structures including: a. a base component that includes a ring-shaped first flange that has an inner periphery and a plurality of circumferentially spaced openings therein through which said stud bolts extend when said first flange rests on said flat horizontal surface of one of said foundations, a cylindrical first wall that extends upwardly from said inner periphery to develop into a circular outwardly extending first body shoulder, and a second cylindrical wall that extends upwardly from a circular outer extremity of said body shoulder, said second cylindrical wall of substantially less height than said first cylindrical wall; b. a top assembly component that removably supports said traffic cover and extends downwardly therefrom, said top assembly including a cylindrical wall member on the lower extremity thereof; c. a riser component that includes a cylindrical shell that has an upper portion and a lower portion, said upper portion including an outwardly extending second body shoulder that has a cylindrical wall piece extending upwardly from the outer periphery thereof, said cylindrical wall member of said top resting on said second body shoulder and cooperating with said cylindrical wall piece to define a first annulus space therebetween and said lower portion of said riser resting on said first body shoulder and cooperating with said second cylindrical wall to define a second annulus space therebetween; d. first resilient means in said first annulus space for removably effecting a seal between said cylindrical wall member of said top assembly and said cylindrical wall piece on said upper portion of said riser; e. second means in said second annulus space for bonding and sealing said lower portion of said riser to said base; f. third means for sealing said flange of said base to said horizontal surface of said foundation; and g. a plurality of nuts that engage said stud bolts to secure said flange of said base to said foundation.