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Application

Expansion shell bolts KR-1/Ø28-M18 i KR-2/Ø28-M18 are designed for use in roof and ribs control as an independent or secondary roof bolting system. They can also be used for suspending various elements of mining equipment.

Technical description

KR-1/Ø28-M18 i KR-2/Ø28-M18 expansion shell bolts can be made from the following rod types :

Bolt typeRod type

KR-1/Ø28-M18

RS-1SZ/M18

RS-1SZ-Z/M18

RS-1N/M18

RS-1N-Z/M18

ES-1/M18

KR-2/Ø28-M18

RS-2SZ/M18

RS-2SZ-Z/M18

RS-2N/M18

RS-2N-Z/M18

ES-2/M18

Bolt rods are plain steel bars of ø18,3 mm made of AP 600 steel in accordance with ZN-97/AP-2 standard. The rods may vary in terms of shape and the size of forged head at the bottom. The top of the rod ends with a rolled M18 thread.M18.

KR-1/Ø28-M18 i KR-2/Ø28-M18 expansion shells measuring 28 mm in diameter fix the bolt in the hole KR-1/Ø28-M18 shell consists of a serrated sleeve of ø28 and one expander, KR-2/Ø28-M18 shell consists of two serrated sleeves and two expanders.

Bolts may be fitted with the following types of washers: square, square with a side hole, round or octagonal. The washer plates vary in terms of press forming method and thickness. The washers have a center hole of ø27 mm or ø29 mm. Plates with side hole of ø15 can be used for attaching elements of mining equipment and should be used when there is no hole in the rod. All the washers are made of 6 mm plate.

Technical data

SpecificationsValue

 

Rod diameter

 

 

ø18,3 mm

 

Thread

 

M18

 

Rod length

1200 ; 1400 ; 1600 ; 1800 ;

2000 ; 2200 ; 2400 ; 2600 ; 3000 ; 3200 mm

Head diameter:

KR-1/Ø28-M18

KR-2/Ø28-M18

 

 

ø 28 mm

Head length:

KR-1/Ø28-M18

KR-2/Ø28-M18

 

 

74 mm

110 mm or 130 mm

 

Bolt capacity required by regulations

 

min 100 kN

 

Useful load

 

130 kN

Installation procedure

Bolts should be installed in a dry drill hole made with a ø28 mm bit, after cleaning the drill dust. The hole length should be the same as the bolt.
Assemble the bolt by putting a washer and screwing the shell on the rod.
Insert the bolt into the hole and push until the washer rests against the rock surface.
Rotate the bolt causing the expansion of the shell in the hole.
Tighten the bolt applying 250 Nm torque in order to obtain the pretension of at least 30 kN.


KR-1/Ø28-M18 and KR-2/Ø28-M18 expansion bolts have Certificate of Conformity No. 92/2005 issued by "INOVA" Technical Innovation Centre Ltd. in Lubin.