초록 ▼

A near-surface collection manifold for extracting and/or venting sub-surface gas from beneath a geomembrane includes a plenum defining an enclosure with an upper portion. A conduit extends upwardly from the upper portion of the plenum, the conduit communicating with the interior volume of the plenum

A near-surface collection manifold for extracting and/or venting sub-surface gas from beneath a geomembrane includes a plenum defining an enclosure with an upper portion. A conduit extends upwardly from the upper portion of the plenum, the conduit communicating with the interior volume of the plenum and has external threads for receiving a threaded nut thereon. The conduit is adapted and provided for extending through an aperture in the geomembrane for withdrawing sub-surface gas from within the interior volume of the plenum and through the geomembrane. A gasket having an opening formed therein is slipped over the conduit and above the geomembrane so that the geomembrane is sandwiched between the gasket and the upper portion of the plenum. A threaded nut is fitted to the conduit and above the gasket for securing the gasket against the geomembrane, thereby sealing the geomembrane to the upper portion of the plenum.

대표청구항 ▼

1. A near-surface collection manifold for extracting, venting, or both extracting and venting sub-surface gas from beneath a geomembrane having an aperture formed therein, the collection manifold comprising: a plenum for drawing in or receiving the sub-surface gas, the plenum comprising an enclosure

1. A near-surface collection manifold for extracting, venting, or both extracting and venting sub-surface gas from beneath a geomembrane having an aperture formed therein, the collection manifold comprising: a plenum for drawing in or receiving the sub-surface gas, the plenum comprising an enclosure defining an interior volume, wherein the enclosure includes a substantially flat upper portion, a lower portion, and a peripheral sidewall extending therebetween, wherein the peripheral sidewall includes an upper sidewall section extending downward from the enclosure upper portion, a lower sidewall section extending upward from the enclosure lower portion, and an intermediate section extending between the upper and lower sidewall sections, wherein the intermediate sidewall section has at least a portion that is inwardly-recessed from the upper and lower sidewall sections, wherein the inwardly-recessed intermediate sidewall section defines a smaller lateral dimension than the upper and lower sidewall sections and defines a recess that extends inwardly relative to the upper and lower sidewall sections, wherein the enclosure further comprises plural apertures for drawing in or receiving the sub-surface gas, and wherein the apertures are positioned in the inwardly-recessed intermediate sidewall section so that the apertures are laterally offset inwardly from the upper and lower sidewall sections and shrouded within the recess with the upper and lower sidewall sections positioned laterally outward relative to the apertures, wherein in use the geomembrane is spaced outwardly from the inwardly-recessed, apertured, intermediate sidewall section by interference with the non-recessed upper and lower sidewall sections and not blocking flow through the apertures of the sub-surface gas;a conduit rigidly connected to and extending upwardly from the plenum, the conduit communicating with the interior volume of the plenum and having external threads, the conduit being adapted and provided for extending through the aperture in the geomembrane for communicating the sub-surface gas from within the interior volume of the plenum and through the geomembrane;a substantially flat gasket having an opening formed therein and slipped over the conduit and above the geomembrane so that the geomembrane is sandwiched between the gasket and the substantially flat upper portion of the plenum; anda threaded nut fitted over the external threads of the conduit and above the flat gasket for securing the gasket against the geomembrane to seal the geomembrane to the substantially flat upper portion of the plenum. 2. A near-surface collection manifold as claimed in claim 1 further comprising a substantially flat washer positioned between the threaded nut and the gasket. 3. A near-surface collection manifold as claimed in claim 1 wherein the plenum is generally box-like. 4. A near-surface collection manifold as claimed in claim 1 wherein the plenum is generally puck-shaped. 5. A near-surface collection manifold as claimed in claim 1 wherein the substantially flat gasket comprises a compressible seal. 6. A near-surface collection manifold as claimed in claim 1 wherein the substantially flat gasket comprises a polymeric sheet. 7. A near-surface collection manifold as claimed in claim 1 wherein the substantially flat gasket is annular. 8. A near-surface collection manifold as claimed in claim 1 wherein the substantially flat gasket is disk-like. 9. A near-surface collection manifold as claimed in claim 1, further comprising a weld, wherein the conduit is rigidly connected to the substantially flat portion of the plenum by the weld. 10. A near-surface collection manifold as claimed in claim 1 wherein the substantially flat gasket comprises a resilient material. 11. A near-surface collection manifold for extracting, venting, or extracting and venting sub-surface gas from beneath a geomembrane having an aperture formed therein, the collection manifold comprising: a plenum for receiving the sub-surface gas, the plenum comprising an enclosure with an upper portion and defining an interior volume, wherein the enclosure is generally round and has a peripheral sidewall including an upper sidewall section, a lower sidewall section, an intermediate sidewall section therebetween, a peripheral inwardly recessed groove formed around the plenum by the intermediate sidewall section and extending inwardly relative to the upper and lower sidewall sections, and a series of sidewall perforations for communicating the sub-surface gas from outside the plenum to inside the plenum, wherein the perforations are defined in the inwardly-recessed intermediate sidewall section so that the perforations are offset inwardly from the upper and lower sidewall sections with the upper and the lower sidewall sections positioned laterally outward relative to the perforations, and wherein the inwardly recessed groove acts as a shroud for the perforations to prevent the geomembrane from blocking the perforations;a conduit rigidly connected to an extending upwardly from the upper portion of the plenum, the conduit communicating with the interior volume of the plenum and having external threads, the conduit being adapted and provided for extending through the aperture in the geomembrane for withdrawing the sub-surface gas from within the interior volume of the plenum and through the geomembrane; anda threaded nut fitted over the external threads of the conduit for securing the geomembrane to the plenum to seal the geomembrane to the upper portion of the plenum. 12. A near-surface collection manifold as claimed in claim 1 wherein the recess forms a circumferential groove. 13. A near-surface collection manifold as claimed in claim 11 wherein the plenum is generally puck-shaped and the upper portion has upper-portion perforations formed therein for admitting the sub-surface gas. 14. A near-surface collection manifold for extracting, venting, or both extracting and venting sub-surface gas from beneath a geomembrane having an aperture formed therein, the collection manifold comprising: a plenum for drawing in or receiving the sub-surface gas, the plenum defining an interior volume, wherein the plenum includes an upper portion, a lower portion, and a peripheral sidewall extending therebetween, wherein the peripheral sidewall includes an upper sidewall section, a lower sidewall section, and an intermediate section extending between the upper and lower sidewall sections, wherein the intermediate sidewall section has at least a portion that is inwardly-recessed from the upper and lower sidewall sections, defines a smaller lateral dimension than the upper and lower sidewall sections, and defines a recess that extends inwardly relative to the upper and lower sidewall sections, wherein the plenum further comprises plural apertures for drawing in or receiving the sub-surface gas, and wherein at least one of the apertures is defined in the inwardly-recessed intermediate sidewall section so that the at least one aperture is laterally offset inwardly from the upper and lower sidewall sections and shrouded within the recess with the upper and lower sidewall sections positioned laterally outward relative to the aperture, wherein in use the geomembrane is spaced outwardly from the inwardly-recessed, apertured, intermediate sidewall section by interference with the upper and lower sidewall sections and not blocking flow of the sub-surface gas through the apertures; anda conduit rigidly connected to and extending upwardly from the plenum, the conduit communicating with the interior volume of the plenum and adapted to extend through the aperture in the geomembrane for communicating the sub-surface gas from within the interior volume of the plenum and through the geomembrane. 15. A near-surface collection manifold as claimed in claim 14 wherein the recess extends about the entire periphery of the plenum to form a continuous peripheral groove.