Patent US669898A successfully refreshed from Google Patents.
Patent US3859802A successfully refreshed from Google Patents.
US3859802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasketed watertight segmented tunnel linings
Assignee: Bethlehem Steel Corp
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Filing: 1973-06-20
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Granted: 1975-01-14
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Expires: 1993-06-20
Abstract
Abstract A segmented primary tunnel lining is provided having longitudinal and circumferential bolted joints in which an elastic gasket is placed between corresponding jointed flanges of the circumferential joints and between the corresponding jointed end plates of the longitudinal joints. The flanges and end plates are deformed by high strength bolts to exhibit metal-to-metal contact in the area of the bolts for joint stiffness. The gaskets are positioned to the outside of the bolts for prevention of leaks.
Inventors
- 👤 James B Platner
- 👤 Iii Charles M Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:44
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/38; E21D11/385; E21D11/14; E21D11/15
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
In a circumferential joint for connecting adjacent arcuate metallic segments of a tunnel lining subject to jacking forces, said segments including inwardly extending flanges having opposed plane surfaces jointed together by bolts, the improvement comprising: a. a gasket positioned between and in contact with said plane surfaces of said flanges and extending only over a portion of said surfaces adjacent the outer end of said flanges for sealing; and b. metal-to-metal contact between said plane surfaces of said flanges in the area of said bolts, for improved joint stiffness and resistance to creep of said gasket during jacking and bolting.
Claim 2
Dependent Claim
100 words
In a circumferential joint for connecting adjacent arcuate metallic segments of a tunnel lining subject to jacking forces, said segments including inwardly extending flanges having opposed plane surfaces jointed together by bolts, the improvement comprising: a. a gasket positioned between and in contact with said plane surfaces of said flanges and extending only over a portion of said surfaces adjacent the outer end of said flanges for sealing; and b. metal-to-metal contact between said plane surfaces of said flanges in the area of said bolts, for improved joint stiffness and resistance to creep of said gasket during jacking and bolting.
Claim 3
Dependent Claim
27 words
The invention of claim 1 in which said gasket is a neoprene having a durometer less than 39 and a tensile strength in excess of 2,000 psi.
Claim 4
Dependent Claim
104 words
In a longitudinal joint for connecting adjacent arcuate metallic segments of a tunnel lining subject to jacking forces, said segments including inwardly extending end plates having opposed plane surfaces jointed together by bolts, the improvement comprising: a. a gasket positioned between and in contact with said plane surfaces of said end plates and extending only over a portion of said surfaces adjacent the outer end of said end plates for sealing; and b. metal-to-metal contact between said plane surfaces of said end plates in the area of said bolts, for improved joint stiffness and resistant to creep of said gasket during jacking and bolting.
Claim 5
Dependent Claim
104 words
In a longitudinal joint for connecting adjacent arcuate metallic segments of a tunnel lining subject to jacking forces, said segments including inwardly extending end plates having opposed plane surfaces jointed together by bolts, the improvement comprising: a. a gasket positioned between and in contact with said plane surfaces of said end plates and extending only over a portion of said surfaces adjacent the outer end of said end plates for sealing; and b. metal-to-metal contact between said plane surfaces of said end plates in the area of said bolts, for improved joint stiffness and resistant to creep of said gasket during jacking and bolting.
Claim 6
Dependent Claim
27 words
The invention of claim 3 in which said gasket is a neoprene having a durometer less than 39 and a tensile strength in excess of 2,000 psi.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |