US3698196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reinforcing loose rock and coal
Assignee: Bergwerksverband GmbH
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Filing: 1971-03-03
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Granted: 1972-10-17
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Expires: 1991-03-03
Abstract
Abstract A plastic foil container having two separate compartments filled with the components of a foaming mixture, is inserted into a bore drilled into loose and caving rock or coal, and broken by a pointed rod inserted into the bore so that after sealing said bore with a plug a foam mixture fills, expanding due to swelling pressure, the bore and surrounds loose and caving rock or coal and reinforces the rock after hardening, particularly when the rod is left in the bore.
Inventors
- 👤 Alfons Jankowski
- 👤 Otto-Ernst Glaesmann
- 👤 Gerhard Haake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/10; E21D1/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
A method for reinforcing loose rock, comprising drilling into the rock at least one bore having a closed bottom portion and an entrance opening on the rock surface; inserting a breakable container into said closed bottom portion spaced from said entrance opening, said container having at least two separate compartments filled with two components, respectively, which form a resinous hardenable expanding foaming mixture, when mixed; breaking said container in said bottom portion to establish communication between said compartments so that said components mix in said bottom portion of said bore; and closing said entrance opening before said mixture fully expands and hardens so that said mixture is confined and enclosed within a closed space in said bore while expanding, said mixture expanding and filling said Closed space to said closed entrance port and entering under pressure between loose rock portions surrounding said bore whereupon said mixture hardens so that the rock around said bore is reinforced.
Claim 2
Independent Claim
156 words
A method for reinforcing loose rock, comprising drilling into the rock at least one bore having a closed bottom portion and an entrance opening on the rock surface; inserting a breakable container into said closed bottom portion spaced from said entrance opening, said container having at least two separate compartments filled with two components, respectively, which form a resinous hardenable expanding foaming mixture, when mixed; breaking said container in said bottom portion to establish communication between said compartments so that said components mix in said bottom portion of said bore; and closing said entrance opening before said mixture fully expands and hardens so that said mixture is confined and enclosed within a closed space in said bore while expanding, said mixture expanding and filling said Closed space to said closed entrance port and entering under pressure between loose rock portions surrounding said bore whereupon said mixture hardens so that the rock around said bore is reinforced.
Claim 3
Dependent Claim
74 words
The method of claim 1 wherein said breaking of said container is carried out by inserting a rod into said bore after insertion of said container into said bottom portion, said rod having a length corresponding to the depth of said bore so as to leave said entrance opening free for closing so that after closing of said entrance bore, said rod remains in said bore for reducing the free volume of said bore.
Claim 4
Dependent Claim
109 words
The method of claim 1 wherein the step of closing said entrance opening includes the steps of inserting an other container into said entrance opening after inserting of said container into said bottom portion of said bore, said other container having at least two compartments filled with substances, respectively, which form, when mixed, an other mixture which hardens quicker than said foaming mixture, and breaking said other container when breaking said container in said bottom portion of said bore so that said other mixture is formed which quickly hardens in said entrance opening to close said entrance opening before said foaming mixture has fully expanded in the closed bore.
Claim 5
Dependent Claim
31 words
The method of claim 2 wherein said rod consists of wood and has a non-circular cross section; and wherein the leading end of said rod is shaped for cutting said container.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said leading end of said rod has a sharp metal or plastic fitting.
Claim 7
Dependent Claim
37 words
The method of claim 2 wherein said rod has an agitating means attached to the leading end thereof, and including the step of turning said rod with said agitating means in said bore for mixing said components.
Claim 8
Dependent Claim
71 words
The method of claim 2 wherein said container includes an outer tubular wall, an inner tubular wall in said outer tubular wall having the same length, and clips closing the ends of said tubular walls at the ends of said container; and wherein one of said compartments is formed in said inner tubular wall, and the other compartment is formed within said outer tubular wall and around said inner tubular wall.
Claim 9
Dependent Claim
27 words
The method of claim 7 wherein said inner and outer tubular walls consist of synthetic plastic foils adapted to be pierced and broken by said inserted rod.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein said mixture includes polyurethanes and water.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein said mixture includes a polyester and a propellant.
Claim 12
Dependent Claim
22 words
The method of claim 1 wherein said mixture includes in addition to said components, a thickening powder for thixotropicly adjusting said mixture.
Claim 13
Dependent Claim
26 words
The method of claim 11 wherein said thickening powder is a mineral powder selected from the group consisting of rock-powder, aerosil, talcum, kaolin and asbestos flakes.
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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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |