PL115994B1 - Mine roof support - Google Patents
Mine roof support Download PDFInfo
- Publication number
- PL115994B1 PL115994B1 PL1978207693A PL20769378A PL115994B1 PL 115994 B1 PL115994 B1 PL 115994B1 PL 1978207693 A PL1978207693 A PL 1978207693A PL 20769378 A PL20769378 A PL 20769378A PL 115994 B1 PL115994 B1 PL 115994B1
- Authority
- PL
- Poland
- Prior art keywords
- plates
- flexible
- units
- stands
- fasteners
- Prior art date
Links
- 238000009412 basement excavation Methods 0.000 claims description 8
- 238000005065 mining Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
- E21D23/0017—Pile type supports
- E21D23/0021—Pile type supports comprising two walking elements
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/307—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by introduction of halogen; by substitution of halogen atoms by other halogen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
- C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
- C07C67/343—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
- C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D277/22—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
- C07D277/30—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
- E21D23/0409—Aligning or guiding means for the supports or for the constitutive parts of the supports
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
- Earth Drilling (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL1978207693A PL115994B1 (en) | 1978-06-15 | 1978-06-15 | Mine roof support |
| DE19792923745 DE2923745A1 (de) | 1978-06-15 | 1979-06-12 | Hydraulischer grubenausbau |
| AT0426279A AT366775B (de) | 1978-06-15 | 1979-06-15 | Ausbau |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL1978207693A PL115994B1 (en) | 1978-06-15 | 1978-06-15 | Mine roof support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL207693A2 PL207693A2 (de) | 1980-02-11 |
| PL115994B1 true PL115994B1 (en) | 1981-05-30 |
Family
ID=19989982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL1978207693A PL115994B1 (en) | 1978-06-15 | 1978-06-15 | Mine roof support |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT366775B (de) |
| DE (1) | DE2923745A1 (de) |
| PL (1) | PL115994B1 (de) |
-
1978
- 1978-06-15 PL PL1978207693A patent/PL115994B1/pl not_active IP Right Cessation
-
1979
- 1979-06-12 DE DE19792923745 patent/DE2923745A1/de not_active Withdrawn
- 1979-06-15 AT AT0426279A patent/AT366775B/de active
Also Published As
| Publication number | Publication date |
|---|---|
| AT366775B (de) | 1982-05-10 |
| PL207693A2 (de) | 1980-02-11 |
| DE2923745A1 (de) | 1980-01-03 |
| ATA426279A (de) | 1981-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Decisions on the lapse of the protection rights |
Effective date: 20071231 |