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Job Breakdown Sheets

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.

  (a) 
Mark breaking off lines on roof.
  (b) 
Set rows of props with front of the prop immediately behind the breaking off line. Prop to be tight between roof and floor.
  (c) 
Set a row of stoppers under breaking off girder.
  (d) 
Protect any cables and machinery.

4: Drill holes.

  (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).
  (b) 
Select suitable place for holes to be drilled; observe any instructions given by a shotfirer.
  (c) 
Drill holes to the required depth (taking care that they do not extend over line of stoppers or breaking off props).
  (d) 
Mark direction of holes on the roof.

5: Remove supports.

  (a) 
Remove any props within the area to be blasted. Use a Sylvester and chain ("Training Manual", No. 5, p. 27).

6: Fire the shots.

Observe shotfirer's instructions.

7: Examine the area after firing.

  (a) 
Return to place when instructed by shotfirer.
  (b) 
Examine roof and sides for loose and unsafe stones, pull them down.
  (c) 
Note any damage to permanent supports and rectify.

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.

  (a) 
Check that the supports are set to line and the roof and sides properly secured.
  (b) 
Check that the gateside packs are properly constructed.
  (c) 
Collect tools and place where safe.

 

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