US3861155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumpable rockbolt method
Assignee: United States Atomic Energy Commission
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Filing: 1972-12-05
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Granted: 1975-01-21
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Expires: 1992-12-05
Abstract
Abstract Method and apparatus for producing rockbolts in the roof of a subterranean cavity in whwch two components of an ambient temperature curable resin system are premixed and then inserted into a bore hole. The mixture is permitted to polymerize in situ and then the hardened material is cut off at the entrance to the hole leaving a hardened portion for insertion into the next hole as a precursor. In a preferred embodiment a flexible glass roving is employed to reinforce the material in the hole and a metal tube inserted to support the roving while it is fed into the hole and also to provide venting. The roving and tube is then cut off and left in the hole.
Inventors
- 👤 Meyer Steinberg
- 👤 Bernard Manowitz
- 👤 Charles H Waide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:12
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0006; E21D20/00; E21D20/02; E21D20/028
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A method of reinforcing the roof of a stuberranean cavity comprising the steps of drilling a series of spaced holes upwardly into said roof, injecting into and filling one of said holes with a polymerizable mixture containing continuous filaments, some of said mixture extending out of the hole being filled, after a period of time sufficient to permit said mixture to harden in situ, removing the hardened portion of said mixture extending out of said hole, and subsequently inserting said hardened portion into the next hole to be filled as a precursor for mixture inserted into said next hole.
Claim 2
Independent Claim
99 words
A method of reinforcing the roof of a stuberranean cavity comprising the steps of drilling a series of spaced holes upwardly into said roof, injecting into and filling one of said holes with a polymerizable mixture containing continuous filaments, some of said mixture extending out of the hole being filled, after a period of time sufficient to permit said mixture to harden in situ, removing the hardened portion of said mixture extending out of said hole, and subsequently inserting said hardened portion into the next hole to be filled as a precursor for mixture inserted into said next hole.
Claim 3
Dependent Claim
41 words
The method of claim 1 in which a continuous venting tube is injected with said mixture and filaments into said hole to permit entrapped gases to escape during filling of the hole and To provide reinforcing of said mixture upon polymerization.
Claim 4
Independent Claim
104 words
A method of reinforcing the roof of a subterranean cavity having an upwardly extending hole therein comprising the steps of mixing first and second components of a polymerizable mixture, injecting the mixture containing continuous filaments of nonflamable material into said hole, some of said mixture and material extending out of the hole, and after a period of time sufficient to permit said mixture to harden in situ, removing the hardened portion of said mixture and material extending out of said hole and subsequently inserting said hardened portion into the next hole to be filled as a precursor for mixture inserted into a next hole.
Claim 5
Independent Claim
104 words
A method of reinforcing the roof of a subterranean cavity having an upwardly extending hole therein comprising the steps of mixing first and second components of a polymerizable mixture, injecting the mixture containing continuous filaments of nonflamable material into said hole, some of said mixture and material extending out of the hole, and after a period of time sufficient to permit said mixture to harden in situ, removing the hardened portion of said mixture and material extending out of said hole and subsequently inserting said hardened portion into the next hole to be filled as a precursor for mixture inserted into a next hole.
References Cited (Backward Citations)
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US3287920A
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US3491497A
Cited
US3436923A
Cited
US3716386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |