US3745738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant manhole shaft and method of making same
Assignee: Individual
•
Filing: 1971-09-07
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Granted: 1973-07-17
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Expires: 1991-09-07
Abstract
Abstract This invention is for a corrosion resistant manhole shaft for sewer drains, storm drains and underground vaults and a method of making same which is comprised of tubular elements either cylindrical or noncylindrical of reinforced plastic impervious to moisture and hydrogen sulfide, said tubular members being vertically positioned in a hole in the ground intercepting the path of a sewer line or an underground chamber and extending upward to the level of the ground surface. A removable liner is positioned about the vertically aligned tubular members and radially spaced therefrom. Concrete is poured into the cavity between the exterior of the tubular members and the liner. Thereafter, the liner is removed and sand or other similar fill is poured into the ground hole between the ground hole wall and the hardened concrete. This invention is also for a method of making corrosion resistant manhole shafts by spraying or blowing to a desired thickness a glass reinforced polyester or other plastic which is impervious to moisture and hydrogen sulfide upon the inner surface of existing conventional manhole shafts, so as to form a plastic liner.
Inventors
- 👤 F Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:15
CPC Classifications
E; E02; E02D; E02D29/00; E02D29/12; E02D29/124; E02D29/125
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
The method of making a corrosion reSistant manhole shaft for use in ground cavities for underground conduit systems, comprising: providing an enclosed hollow chamber comprised of reinforced plastic of predetermined thickness impervious to liquids and hydrogen sulfide and having ingress and egress secured to a base situated in a cavity in the ground; providing a vertically extending tubular section of reinforced plastic of predetermined thickness impervious to liquids and hydrogen sulfide to said hollow chamber so as to permit uninterrupted passage between said tubular section and enclosed hollow chamber; vertically positioning an annular collar means of predetermined height on the upper edge of said tubular section so as to be in a preselected relationship with the ground surface; vertically seating a manhole cover receptacle on said collar so as to intersect the ground surface therewith; placing a hollow shell about said hollow chamber and tubular section so as to be laterally spaced therefrom; filling the space between said hollow shell and said hollow chamber and tubular section with a fluid substance so as to leave only the manhole cover receptacle exposed; and removing said hollow shell when said hardening fluid substance is partially hardened.
Claim 2
Independent Claim
194 words
The method of making a corrosion reSistant manhole shaft for use in ground cavities for underground conduit systems, comprising: providing an enclosed hollow chamber comprised of reinforced plastic of predetermined thickness impervious to liquids and hydrogen sulfide and having ingress and egress secured to a base situated in a cavity in the ground; providing a vertically extending tubular section of reinforced plastic of predetermined thickness impervious to liquids and hydrogen sulfide to said hollow chamber so as to permit uninterrupted passage between said tubular section and enclosed hollow chamber; vertically positioning an annular collar means of predetermined height on the upper edge of said tubular section so as to be in a preselected relationship with the ground surface; vertically seating a manhole cover receptacle on said collar so as to intersect the ground surface therewith; placing a hollow shell about said hollow chamber and tubular section so as to be laterally spaced therefrom; filling the space between said hollow shell and said hollow chamber and tubular section with a fluid substance so as to leave only the manhole cover receptacle exposed; and removing said hollow shell when said hardening fluid substance is partially hardened.
Claim 3
Dependent Claim
46 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 1 wherein the enclosed hollow chamber is provided by spraying glass reinforced polyester plastic onto the internal surfaces of an existing concrete enclosed chamber.
Claim 4
Dependent Claim
47 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 1 wherein the vertically extending tubular section is provided by spraying glass reinforced polyester plastic onto the internal surfaces of an existing concrete manhole shaft.
Claim 5
Dependent Claim
35 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 1 wherein said tubular section is pre-formed and comprised of glass reinforced plastic.
Claim 6
Dependent Claim
33 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 4 wherein said enclosed hollow chamber is pre-formed and is tubular.
Claim 7
Dependent Claim
33 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 4 wherein said enclosed hollow chamber is pre-formed and is rectangular.
Claim 8
Dependent Claim
46 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 4 wherein said tubular section is comprised of plurality of pre-formed separate tubular elements and said elements are vertically aligned on said hollow chamber.
Claim 9
Dependent Claim
49 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 1 wherein a corrosion resistant means for vertical egress and ingress is positioned so as to radially protrude inwardly from the inner wall of said tubular section.
Claim 10
Dependent Claim
82 words
The method of making a corrosion resistant manhole shaft for use in ground cavities for underground conduit systems as described in claim 8 wherein said vertical egress and ingress means is comprised of vertically stacked elements formed so as to provide a face and toes interconnected with a pair of legs, said face having a foot supporting opening formed therein and the toes of said element are secured to the inner wall of said tubular section, said elements comprised of reinforced plastic.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |