Breakdown No. 24
Ripping
1: Collect tools required.
2: Examine the working place.
3: Set breaking off props and stoppers.
4: Drill holes.
5: Remove supports.
6: Fire the shots.
7: Examine the area after firing.
8: Advance the forepoling.
9: Secure the face of the ripping.
10: Set roadway supports.
11: Build gateside packs.
12: Examine the completed work.
1: Collect tools required.
Hammer, pick, shovel. Sylvester and chains, drilling tackle, spanner.
2: Examine the working place.
(See
Breakdown No. 11, "Examining the working place — at the ripping lip".)
3: Set breaking off props and stoppers.
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(a) |
Mark breaking off lines on roof.
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(b) |
Set rows of props with front of the prop immediately behind the breaking off line. Prop to be tight between roof and floor.
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(c) |
Set a row of stoppers under breaking off girder.
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(d) |
Protect any cables and machinery.
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4: Drill holes.
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(a) |
Remove supports set to face of ripping. Care should be taken to remove any loose stones so as to avoid accidents ("Training Manual", No. 5).
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(b) |
Select suitable place for holes to be drilled; observe any instructions given by a shotfirer.
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(c) |
Drill holes to the required depth (taking care that they do not extend over line of stoppers or breaking off props).
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(d) |
Mark direction of holes on the roof.
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5: Remove supports.
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(a) |
Remove any props within the area to be blasted. Use a Sylvester and chain ("Training Manual", No. 5, p. 27).
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6: Fire the shots.
Observe shotfirer's instructions.
7: Examine the area after firing.
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(a) |
Return to place when instructed by shotfirer.
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(b) |
Examine roof and sides for loose and unsafe stones, pull them down.
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(c) |
Note any damage to permanent supports and rectify.
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8: Advance the forepoling.
(See
Breakdown, "Forepoling".)
9: Secure the face of the ripping.
(See
Breakdown, "Setting supports to the face of the ripping".)
10: Set roadway supports.
(See Breakdowns, No. 21,
22, and
23, "Setting a straight girder",
"Setting a cambered girder", and
"Setting an arched girder".)
11: Build gateside packs.
(See Breakdown, No. 18, "Building a pack".)
12: Examine the completed work.
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(a) |
Check that the supports are set to line and the roof and sides properly secured.
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(b) |
Check that the gateside packs are properly constructed.
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(c) |
Collect tools and place where safe.
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