Patent US3751926A successfully refreshed from Google Patents.
US3751926A
Expired / Lapsed
US
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Method of erecting wall structures in mine workings
Assignee: Gebr Knauf KG
•
Filing: 1970-11-12
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Granted: 1973-08-14
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Expires: 1990-11-12
Abstract
Abstract A gypsum cement mixture which can be pumped underground for forming wall structures in mine workings comprising a material improving the flow properties of the gypsum cement-water mixture, an additive endowing hydrophobic properties, a colloid which is at the most weakly ionogenic, and a latently hydraulic material.
Inventors
- 👤 R Mueller
- 👤 H Zenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:02
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; E; E21; E21D; E21D11/00; E21D11/04
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
42 words
A method in accordance with claim 1 in which the gypsum cement used further comprises an additive adapted to delay solidification, the solidification of the gypsum cement beginning at the earliest after 5 minutes and ending at the latest after 25 minutes.
Claim 2
Dependent Claim
43 words
A method in accordance with claim 1 in which the gypsum cement used further comprises a regulator fixing the rate of solidification, the solidification of the gypsum cement beginning at the earliest after 5 minutes and ending at the latest after 25 minutes.
Claim 3
Dependent Claim
24 words
A method in accordance with claim 2 in which the solidification of the gypsum cement begins after 7 minutes and ends before 18 minutes.
Claim 4
Dependent Claim
22 words
A method in accordance with claim 1 in which the gypsum cement is a gypsum cement adapted for use for internal plastering.
Claim 5
Dependent Claim
20 words
A method in accordance with claim 1 in which the gypsum cement is a gypsum cement intended for making stucco.
Claim 6
Dependent Claim
37 words
A method in accordance with claim 1 in which the material improving the flow properties is selected from the group consisting of: epoxidated soya oil, fatty acid ester with partially unsaturated components, long chain paraffin, and stearate.
Claim 7
Dependent Claim
25 words
A method in accordance with claim 7 in which the material improving the flow properties is present in a quantity of 0.05 to 1.0 percent.
Claim 8
Dependent Claim
23 words
A method in accordance with claim 1 in which the material improving the flow properties is residue obtained by drying waste sulphite liquor.
Claim 9
Dependent Claim
21 words
A method in accordance with claim 9 in which the residue is present in a quantity of 0.05 to 0.2 percent.
Claim 10
Dependent Claim
15 words
A method in accordance with claim 1 in which the hydrophobic additive is an organosiloxane.
Claim 11
Dependent Claim
21 words
A method in accordance with claim 11 in which the organosiloxane is present in a quantity between 0.005 and 0.05 percent.
Claim 12
Dependent Claim
21 words
A method in accordance with claim 1 in which the colloid is present in a quantity between 0.05 and 0.6 percent.
Claim 13
Dependent Claim
23 words
A method in accordance with claim 1 in which the latently hydraulic material is present in a quantity of 5 to 20 percent.
Claim 14
Dependent Claim
17 words
A method in accordance with claim 14 in which the latently hydraulic material is blast furnace slag.
Claim 15
Dependent Claim
22 words
A method in accordance with claim 2 in which the delaying additive is present in a quantity of 0.005 to 0.2 percent.
Claim 16
Dependent Claim
21 words
A method in accordance with claim 1 in which the gypsum cement is continuously mixed with the water and continuously pumped.
Claim 17
Dependent Claim
27 words
A method in accordance with claim 1 in which the gypsum cement is conveyed with an eccentric-worm pump to the site at which the wall is formed.
Claim 18
Dependent Claim
18 words
A method in accordance with claim 1 in which the wall structure is formed for combatting underground fires.
Claim 19
Dependent Claim
23 words
A method in accordance with claim 1 in which the wall structure formed is used for making a temporary closure to a working.
Claim 20
Dependent Claim
18 words
A method in accorance with claim 1 in which the wall structure comprises anchoring abutments for dam zones.
Claim 21
Dependent Claim
23 words
A method in accordance with claim 1 in which the wall structure is used for holding back blast produced during blasting operations underground.
Claim 22
Dependent Claim
24 words
A method in accordance with claim 1 in which the wall structure is used for filling out of pre-existing wall structure in mine workings.
Claim 23
Dependent Claim
22 words
A method in accordance with claim 1 in which the wall structure is formed in a chamber which is already walled off.
Claim 24
Dependent Claim
24 words
A method in accordance with claim 1 in which for forming the wall shuttering is used made up of grid-like structures covered with sheeting.
Claim 25
Dependent Claim
36 words
A method in accordance with claim 1 in which during the construction of upper parts of shuttering used for forming the wall structure the water-gypsum cement mixture is pumped into the bottom part between the shuttering.
Claim 26
Dependent Claim
21 words
A method in accordance with claim 1 in which the wall structure is used for filling a cavity in a mine.
Claim 27
Dependent Claim
23 words
A method in accordance with claim 1 in which the wall structure is used for filling a callapsed portion in the mine working.
References Cited (Backward Citations)
CA639287A
Cited
US2210545A
Cited
US2434301A
Cited
US2655004A
Cited
US2560619A
Cited
US2791511A
Cited
US3086953A
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 |