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| MINING |
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| TUNNELING |
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| CONSTRUCTION INDUSTRY |
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EXPANSION SHELL BOLTS
Expansion shell cement bolts type AP-KRC-ø42
Intended use
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Expansion shell cement bolts type AP-KRC-ø42 are designed to be used for roof and ribs support in mine working areas as an independent or secondary support system.
Technical description
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Bars are made from :
- reinforcing ribbed bar of dn=20 mm in diameter from steel 34GS according to PN-82/H-93215 standard or
- reinforcing ribbed bar of dn=20 mm in diameter from steel AP-E460 according to ZN-98/AP-5+A1:1999 standard or
- reinforcing ribbed bar of dr=18,2 diameter from steel AP 600 according to ZN-95/AP-3+A1:1999 standard.
Expansion shell KE-4W/M20 or KE4-2K/M20 diameter ø42 mm is element fixing bolt in a hole .
Cement injecting set consist of special spherical washer and plastic pumping pipe.
For this set applied round and square washers 8mm thick and hole ø50 mm.
Technical data
| Rod diameter |
dn = 20 mm
dr = 18,2 mm
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| Rod thread |
M20 |
| Rod length |
od 1500 do 5000 mm (or other acc.to customer need) |
| Shell diameter KE-4W/M20 |
ø 42 mm |
| Shell length KE-4W/M20 |
93 mm |
| Shell diameter KE4-2K/M20 |
ø 42 mm |
| Shell length KE4-2K/M20 |
136 mm |
| Bolt capacity |
over 120 kN |
Installation procedure
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Drill a hole of diameter ø 44 ±0,5 mm and the depth equal to the rod length.
Insert the rod and rotate while pushing causing the shell expand.
Expand shell with the toque at least 250 Nm.
Mount injection head on the spherical washer of the injection set and expand it.
Prepare cement-water mixture of ductile consistency (proportion cement to water 4:1).
Start pumping mortar through injection head controlling air outflow in the washer.
Keep pumping until mortar flow out from the hole in the washer or air stop flowing and rise pressure.
After finishing disconnect injection head.
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