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Friction bolt type Boltex

Application

  • Boltex is used for roof and rib suport maliny In tunnelling.
    The bolting pattern depends on size of the excavation and qualities of the rock mass.
    Due to its unique Anchorage mechanizm, the Bolt can adept to a wide variety of ground conditions and provide good to excellent Anchorage capa city In most rock types.

 

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Technical specyfication

  • Boltex is made out of a welded steel tube folder on itself and sealed AT one extremity, Chile the Rother extremity is set with a special head Cushing used for inflation and retaining of the face plate typically used In rock bolting.
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Technical data

Bolt type

12Mn

12Pl

16Mn

16Pl

24Mn

24Pl

Minimum breaking load

kN

>100

120

>140

160

>200

240

Typical breaking load

kN

>120

>160

>240

Alongation at break

%

>30

>10

>30

>10

>30

>10

Recommended borehole Ф

mm

32 - 39

43 - 52

43 - 52

Optimal borehole Ф

mm

35 - 38

45 - 51

45 - 51

Original tube

mm

41 x 2,0

54 x 2,0

54 x 3,0

Bushing head diameter

mm

30 / 36

41 / 50

41 / 50

Upper Cushing diameter

mm

28

38

38

Standard length

m

1 - 8

Installation water pressure

bar

300

250

300

 

Installation procedure

  • Drill a hole of the depth equal to the Bolt length. Diameter of the hole should be according to the table. Place the bolt In the borehole. Insert the adapter of the pistol charger to the hole In the bolt’s bush. Apply water under right pressure to expand the Bolt.
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