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A stackable riser section having a single side wall having a first open end defined by an edge and a second open, channel end. The riser section includes a plurality of bosses extending to the first open end and connected to an interior surface of the sidewall by narrow webs. A channel, on the chann

A stackable riser section having a single side wall having a first open end defined by an edge and a second open, channel end. The riser section includes a plurality of bosses extending to the first open end and connected to an interior surface of the sidewall by narrow webs. A channel, on the channel end of one riser is adapted to receive the bosses of a mated riser. A wall defining the boss receiving channel has a plurality of slots with at least a portion defined by parallel edges. The slots receive the webs that connect the bosses to the riser sidewall. The bosses are wider than the portion of the slots defined by the parallel edges. The slotted wall includes thickened wedge portions to snugly fit with the first open end of another riser section. A cover is disclosed that includes the same channel end to coact with the first open end of a riser section.

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What is claimed: 1. An access riser section comprising a single sidewall having a first end, a second end, and an inner surface; said second end defining a channel end; a plurality of vertical bosses extending along the inner surface of said sidewall; said bosses connected to said sidewall by offse

What is claimed: 1. An access riser section comprising a single sidewall having a first end, a second end, and an inner surface; said second end defining a channel end; a plurality of vertical bosses extending along the inner surface of said sidewall; said bosses connected to said sidewall by offsetting portions that are narrower than said bosses; said channel end including wall portions defining a channel to receive bosses of another riser section; one of said channel defining wall portions defining a plurality of slots open at an edge of said slot defining wall portion; at least two of said slots including at least a portion defined by parallel edges formed by said slotted wall portion, the spacing of said parallel edges of said at least two slots being wider than the width of said offsetting portions and narrower than the width of said bosses; said at least two slots adapted to receive offsetting portions of another riser section; and wherein said at least two slots further include diverging edges defined by said slotted wall portion extending from said parallel edges and forming a portion of each said slot that is progressively wider than the distance between said parallel edges from the juncture with said parallel edges to said open end of each said at least two slots at said edge of said slotted wall portion. 2. An access riser as claimed in claim 1 wherein said bosses terminate at said first end of said riser section in flat end surfaces and wherein said boss receiving channel includes a projection aligned with each slot defined by said slotted wall portion, said projections defining support surfaces adapted to be supported by the flat end surfaces of bosses of another riser section. 3. An access riser section as claimed in claim 2 wherein said offsetting portions terminate at said first end of said riser section in flat end surfaces and said slotted wall portion defines a terminus edge of each said slot at an end of said parallel edges said terminus edge being coplanar with the support surface of said projection associated with said slot, each said terminus edge adapted to be supported the flat end surface of an offsetting portion of another riser section. 4. An access riser section as claimed in claim 1 wherein said slotted wall portion includes a thickened wedge portion adjacent at least one of said slots, said thickened wedge portion adapted to contact a boss of another riser section. 5. An access riser section as claimed in claim 1 wherein said slotted wall portion includes a thickened wedge portion on each side of each said slot and each said thickened wedge portion is adapted to contact a boss of another riser section. 6. An access riser section as claimed in claim 1 wherein said sidewall is cylindrical. 7. An access riser section as claimed in claim 6 wherein said sidewall includes one boss every 15° about the inner surface of said sidewall. 8. An access riser section as claimed in claim 7 wherein said slotted wall portion defines a slot every 15°. 9. An access riser section as claimed in claim 8 wherein said bosses of a riser section are spaced midway between the slots defined by the slotted wall of said channel end. 10. An access riser section as claimed in claim 1 wherein said bosses have facing surfaces adjacent each side of said offsetting portion that connects said boss to said sidewall, said facing surfaces facing said sidewall, and wherein said slots are sized to receive the offsetting portions of another riser section with the slotted wall portion of the other riser section disposed between said facing surfaces and said sidewall. 11. An access riser section as claimed in claim 10 wherein said slotted wall portion includes thickened wedge portions adjacent at least one side of each said slot, said thickened wedge portion at each slot adapted to contact a boss of another riser section. 12. An access riser section as claimed in claim 11 wherein said slotted wall portion includes a number of slots equal to the number of bosses on said sidewall and a thickened wedge portion adjacent each side of each said slot. 13. A combination of stacked riser sections, each access riser section comprising a single sidewall having a first end, a second end, and an inner surface; said second end defining a channel end; a plurality of vertical bosses extending along the inner surface of said sidewall; said bosses connected to said sidewall by offsetting portions that are narrower than said bosses; said channel end including wall portions defining a channel to receive bosses of another riser section; one of said channel defining wall portions defining a plurality slots open at an edge of said slot defining wall portion; at least two of said slots including at least a portion defined by parallel edges formed by said slotted wall portion, the spacing of said parallel edges of said at least two slots being wider than the width of said offsetting portions and narrower than the width of said bosses; said at least two slots adapted to receive offsetting portions of another riser section; one of said riser sections disposed with the bosses thereof disposed in said channel of the other riser section and with offsetting portions disposed in said at least two of said slots of said other riser section; and wherein said at least two slots of each riser section further include diverging edges defined by said slotted wall portion extending from said parallel edges and forming a portion of each said slot that is progressively wider than the distance between said parallel edges from the juncture with said parallel edges to said open end of each said at least two slots at said edge of said slotted wall portion. 14. A combination of stacked riser sections as claimed in claim 13 wherein said bosses and offsetting portions of each said riser section terminate at said first end of said riser section in flat end surfaces and wherein said boss receiving channel includes a projection aligned with each slot defined by said slotted wall portion, said projections defining support surfaces to be supported by the flat end surfaces of bosses of another riser section, one of said riser sections disposed with said flat end surfaces of bosses supporting said support surfaces of said projections of the other riser section. 15. A combination of stacked riser sections as claimed in claim 14 wherein said offsetting portions terminate at said first end of said riser section in flat end surfaces and said slotted wall portion defines a terminus edge of each said slot at an end of said parallel edges, said terminus edge being coplanar with the support surface of said projection associated with said slot, each said terminus edge adapted to be supported by the flat end surface of an offsetting portion of another riser section, the flat end surfaces of said offsetting portions of one of said riser sections disposed on said terminus edges of slots of the other riser section. 16. A combination of stacked riser sections as claimed in claim 13 wherein said slotted wall portion of each said riser section includes a thickened wedge portion adjacent at least one of said slots, said at least one thickened wedge portion contacting a boss of the other riser section. 17. A combination of stacked riser sections as claimed in claim 16 wherein said slotted wall portion of each said riser section includes a thickened wedge portion on each side of each said slot contacting a boss of the other riser section. 18. A combination of stacked riser sections as claimed in claim 13 wherein said sidewall of each riser section is cylindrical. 19. A combination of stacked riser sections as claimed in claim 18 wherein said sidewall of each rising section includes one boss every 15° about the inner surface of said sidewall. 20. A combination of stacked riser sections as claimed in claim 19 wherein said slotted wall portion of each riser section defines a slot every 15°. 21. A combination of stacked riser sections as claimed in claim 20 wherein said bosses of each riser section are spaced midway between the slots defined by the slotted wall of said channel end. 22. A combination of stacked riser sections as claimed in claim 13 wherein said bosses of each said riser section have facing surfaces adjacent each side of said offsetting portion that connects said boss to said sidewall, said facing surfaces facing said sidewall, and wherein said slots are sized to receive the offsetting portions of another riser section with the slotted wall portion of the other riser section disposed between said facing surfaces and said sidewall and wherein one of said riser sections is disposed with the slotted wall thereof disposed between said facing surfaces and said side wall of the other of said riser section. 23. A combination of stacked riser sections as claimed in claim 22 wherein said slotted wall portion of each said riser section includes thickened wedge portions adjacent at least one side of each said slot, said thickened wedge portion at each slot adapted to contact a boss of another riser section. 24. A combination of stacked riser sections as claimed in claim 13 wherein said slotted wall portion of each said riser section includes a number of slots equal to the number of bosses on said sidewall and a thickened wedge portion on each side of each said slot with the thickened wedge portions of one of said riser sections contacting the bosses of the other riser section. 25. A combination cover and an access riser section having a plurality of vertical bosses extending along the inner surface of a sidewall; said bosses connected to said sidewall by offsetting portions that are narrower than said bosses; said cover having a channel end said channel end including wall portions defining a channel to receive bosses of said riser section; one of said channel defining wall portions defining a plurality of slots open at an edge of said slot defining wall portion; at least two of said slots including at least a portion defined by parallel edges formed by said slotted wall portion, the spacing of said parallel edges of said at least two of said slots being wider than the width of said offsetting portions and narrower than the width of said bosses; said at least two of said slots receiving offsetting portions of said riser section; and said cover disposed on said riser section with said bosses received in said channel and said offsetting portions disposed in said at least two of said slots of said riser section; and wherein said at least two slots further include diverging edges defined by said slotted wall portion extending from said parallel edges and forming a portion of each said slot that is progressively wider than the distance between said parallel edges from the juncture with said parallel edges to said open end of each of said at least two slots at said edge of said slotted wall portion. 26. A combination cover and an access riser as claimed in claim 25 wherein said bosses terminate at said first end of said riser section in flat end surfaces and wherein said boss receiving channel includes a projection aligned with each slot defined by said slotted wall portion, said projections defining support surfaces supported by the flat end surfaces of bosses of said riser section. 27. A combination cover and an access riser as claimed in claim 26 wherein said offsetting portions terminate at said first end of said riser section in flat end surfaces and said slotted wall portion defines a terminus edge of each said slot at an end of said parallel edges said terminus edge being coplanar with the support surface of said projection associated with said slot, each said terminus edge supported by the flat end surface of one of said offsetting portions of said riser section. 28. A cover and an access riser as claimed in claim 25 wherein said slotted wall portion includes a thickened wedge portion adjacent at least one of said slots, said thickened wedge portion contacting a boss of said riser section. 29. A cover and an access riser as claimed in claim 25 wherein said slotted wall portion includes a thickened wedge portion on each side of each said slot each said thickened wedge portion contacting a boss of said riser section. 30. A cover and an access riser section as claimed in claim 25 wherein said cover and said sidewall are cylindrical. 31. A cover and an access riser section as claimed in claim 30 wherein said sidewall includes one boss every 15° about the inner surface of said sidewall. 32. A cover and an access riser section as claimed in claim 31 wherein said slotted wall portion defines a slot every 15°. 33. A cover and an access riser section as claimed in claim 32 wherein said bosses of said riser section are spaced midway between the slots defined by the slotted wall of said channel end. 34. A cover and an access riser section as claimed in claim 25 wherein said bosses have facing surfaces adjacent each side of said offsetting portion that connects said boss to said sidewall, said facing surfaces facing said sidewall, and wherein said slots are sized to receive the offsetting portions of said riser section with the slotted wall portion of the said channel end disposed between said facing surfaces and said sidewall of said riser section. 35. A cover and an access riser section as claimed in claim 34 wherein said slotted wall portion of said channel end includes thickened wedge portions adjacent at least one side of each said slot, said thickened wedge portion at each slot contacting a boss of said riser section. 36. A cover and an access riser section as claimed in claim 35 wherein said slotted wall portion of said channel end includes a number of slots equal to the number of bosses on said sidewall of said riser section and a thickened wedge portion adjacent each side of each said slot each thickened wedge portion contacting a boss of said riser section. 37. An access riser section as claimed in claim 25 wherein ribs are disposed in said channel, connected between said channel defining walls. 38. An access riser section as claimed in claim 37 wherein said ribs each are disposed on each side of each said slot. 39. An access riser section as claimed in claim 37 wherein said ribs are disposed in pairs associated with each said slot. 40. A combination cover and an access riser section as claimed in claim 25 wherein ribs are disposed in said channel of said cover connected to the channel defining walls. 41. A combination cover and access riser section as claimed in claim 40 wherein said ribs are disposed in pairs, associated with each said slot. 42. An access riser section as claimed in claim 39 wherein said ribs are radial. 43. An access riser section comprising a single sidewall having a first end, a second end, and an inner surface; said second end defining a channel end; a plurality of vertical bosses extending along the inner surface of said sidewall; said bosses connected to said sidewall by offsetting portions that are narrower than said bosses; said channel end including wall portions defining a channel to receive the bosses of another riser section; one of said channel defining wall portions defining a plurality of slots open at an edge of said slot defining wall portion; wherein said bosses have at least one facing surface adjacent the offsetting portion that connects said boss to said sidewall, said at least one facing surface facing said sidewall, and wherein said slots are sized to receive the offsetting portions of another riser with the slotted wall portion of the other riser disposed between said at least one facing surface of each said boss and said sidewall; and wherein said slotted wall portion includes thickened wedge portions adjacent at least one side of at least one of said slots, said thickened wedge portions adapted to contact said at least one facing surface of at least one boss of another riser section, wherein said thickened wedge portions are about 36% to 45% thicker than another portion of said slotted wall portion. 44. An access riser section as claimed in claim 43 wherein said bosses include a facing surface adjacent each side of said offsetting portions and said slotted wall portion includes a thickened wedge portion adjacent each side of each said slot, the wedge portions adjacent a slot adapted to frictionally contact the facing surfaces of a boss of another riser section. 45. A combination of stacked riser sections each comprising a single sidewall having a first end, a second end, and an inner surface; said second end defining a channel end; a plurality of vertical bosses extending along the inner surface of said sidewall; said bosses connected to said sidewall by offsetting portions that are narrower than said bosses; said channel end including wall portions defining a channel to receive the bosses of another riser section; one of said channel defining wall portions defining a plurality of slots open at an edge of said slot defining wall portion; wherein said bosses have at least one facing surface adjacent said offsetting portion that connects said boss to said sidewall, said facing surfaces facing said sidewall, and wherein said slots are sized to receive the offsetting portions of another riser with the slotted wall portion of the other riser disposed between said at least one facing surface of each said boss and said sidewall; wherein said slotted wall portion includes at least one thickened wedge portion adjacent at least one side of at least one of said slots, said at least one thickened wedge portion adapted to contact said at least one facing surface of a boss of another riser section, wherein said at least one thickened wedge portion is about 36% to 45% thicker than another portion of said slotted wall portion; and wherein one of said riser sections is disposed with the bosses thereof in said channel of the other riser section with said at least one thickened wedge portion adjacent at least one side of said at least one slot of said other riser in contact with said at least one facing surface of a boss of the other riser section.