Patent US3224203A successfully refreshed from Google Patents.
US3224203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving tunnels in rock
Assignee: Skanska AB
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Filing: 1963-09-30
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Granted: 1965-12-21
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Expires: 1983-09-30
Abstract
No abstract record available.
Inventors
- 👤 Brannfors Sten Harald
- 👤 Alberts Claes Yngve Hjalmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:14
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/04; E21D11/10; E21D11/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A METHOD OF DRIVING A TUNNEL IN ROCK COMPRISING, IN SEQUENCE, BLASTING ROCK AT THE TUNNEL FACE THEREBY CREATING MUCK IN FRONT OF THE BLASTED TUNNEL FACE, MOVING A CONCRETE SPRAY APPARATUS, HAVING SPRAY HEAD, INTO A POSITION SUCH THAT OPERATOR IS UNDER THE PROTECTION OF A PREVIOUSLY CONCRETE-LINED PART OF THE TUNNEL ROOF, SAID SPRAY APPARATUS HAVING AN EFFECTIVE REACH, FROM BENEATH THE LINED PART OF THE ROOF, OUTWARDLY BENEATH THE UNLINED ROOF PART FORMED BY THE RECENT BLASTING SO THAT THE SPRAY HEAD OF THE APPARATUS IS UNDER AN UNLINED ARCHED ROOF PART FORMED BY THE RECENT BLASTING, STABILIZING SAID LAST-NAMED ARCHED ROOF BY SPRAYING THEREON A LAYER OF QUICK SETTING CONCRETE, SPRAYING MORE CONCRETE ONTO THE ROOF SO AS TO FORM A PROTECTIVE ROOF, AND REMOVING THE MUCK UNDER THE PROTECTION OF THE THUS NEWLY STABILIZED ROOF, COVERING THE PARTS OF THE ROOF AND TUNNEL WALL EXPOSED BY THE REMOVAL OF THE MUCK WITH CONCRETE REPEATING THE ABOVE SEQUENCE AT LEAST ONCE, THEN REINFORCING THE TEMPORARY ROOF FORMED AFTER ONE OF THE PREVIOUS BLASTING, AND THEN REPEATING THE ABOVE SEQUENCE OF OPERATIONS.
Claim 2
Independent Claim
185 words
A METHOD OF DRIVING A TUNNEL IN ROCK COMPRISING, IN SEQUENCE, BLASTING ROCK AT THE TUNNEL FACE THEREBY CREATING MUCK IN FRONT OF THE BLASTED TUNNEL FACE, MOVING A CONCRETE SPRAY APPARATUS, HAVING SPRAY HEAD, INTO A POSITION SUCH THAT OPERATOR IS UNDER THE PROTECTION OF A PREVIOUSLY CONCRETE-LINED PART OF THE TUNNEL ROOF, SAID SPRAY APPARATUS HAVING AN EFFECTIVE REACH, FROM BENEATH THE LINED PART OF THE ROOF, OUTWARDLY BENEATH THE UNLINED ROOF PART FORMED BY THE RECENT BLASTING SO THAT THE SPRAY HEAD OF THE APPARATUS IS UNDER AN UNLINED ARCHED ROOF PART FORMED BY THE RECENT BLASTING, STABILIZING SAID LAST-NAMED ARCHED ROOF BY SPRAYING THEREON A LAYER OF QUICK SETTING CONCRETE, SPRAYING MORE CONCRETE ONTO THE ROOF SO AS TO FORM A PROTECTIVE ROOF, AND REMOVING THE MUCK UNDER THE PROTECTION OF THE THUS NEWLY STABILIZED ROOF, COVERING THE PARTS OF THE ROOF AND TUNNEL WALL EXPOSED BY THE REMOVAL OF THE MUCK WITH CONCRETE REPEATING THE ABOVE SEQUENCE AT LEAST ONCE, THEN REINFORCING THE TEMPORARY ROOF FORMED AFTER ONE OF THE PREVIOUS BLASTING, AND THEN REPEATING THE ABOVE SEQUENCE OF OPERATIONS.
References Cited (Backward Citations)
DE340032C
Cited
US1380400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |