US3751929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of supporting exposed ground or rock
Assignee: Individual
•
Filing: 1971-08-11
•
Granted: 1973-08-14
•
Expires: 1991-08-11
Abstract
Abstract A method of supporting exposed ground or rock including the steps of establishing a formwork of special corrugated panel units in a spaced relationship with the exposed ground or rock and back-filling the space between the ground or rock and the formwork with sprayed concrete is disclosed herein.
Inventors
- 👤 J Bernold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:43
CPC Classifications
E; E01; E01C; E01C11/00; E01C11/16; E01C11/165; E01C3/00; E01C3/006; E04; E04B; E04B5/00; E04B5/16; E04B5/32; E04B5/36; E04B5/38; E04B5/40; E04F; E04F13/00; E04F13/02; E04F13/04; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D11/107; E21D11/14; E21D11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A process for making a tunnel wall safe, comprising the steps of a. arranging panel-like units of the type described as a formwork at a distance from the tunnel area to be made safe; b. initially spraying a cement mortar containing waterglass to the tunnel side surfaces of the permanent formwork; and c. back-filling the space left between the formwork and the tunnel wall with concrete introduced through the formwork.
Claim 2
Dependent Claim
70 words
A process for making a tunnel wall safe, comprising the steps of a. arranging panel-like units of the type described as a formwork at a distance from the tunnel area to be made safe; b. initially spraying a cement mortar containing waterglass to the tunnel side surfaces of the permanent formwork; and c. back-filling the space left between the formwork and the tunnel wall with concrete introduced through the formwork.
References Cited (Backward Citations)
US1281405A
Cited
US1778099A
Cited
US1876205A
Cited
US2208302A
Cited
US2187224A
Cited
DE1240913B
Cited
US3381479A
Cited
US3407609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |