DYWIDAG Rock Bolts

 

Advantages and Characteristics

 

  • high loads with small borehole diameters
  • continuous bar thread allows cutting at any point, length adaptation on site, easy to order and to store
  • coarse thread, insensitive to rough handling
  • high bond along the bar length for anchoring into resin or cement mortar
  • good mixing of resin cartridges through the thread ribs
  • restressing possible
  • angle compensation through dished plates, spherical seats or domed nuts
  • expansion shell enables quick load transfer
type of bar nominal diameter steel grade max. diameter over ribs cross-sectional area A load at yield ultimate load
[mm] [N/mm2] [mm] [mm2] [kN] [kN]
GEWI ® bar with left-hand thread 16 500/550 18 201 101 111
20 500/550 23 314 157 173
25 500/550 28 491 246 270
28 500/550 32 616 308 339
32 500/550 36 804 402 442
GEWI ® Plus with right-hand thread 18 670/800 21 254 170 204
22 670/800 25 380 255 304
25 670/800 28 491 329 393
28 670/800 32 616 413 493
30 670/800 34 707 474 565
GEWI ® bar with right-hand thread 16 450/700 18 207 93 145
THREADBAR ® with right-hand thread 15 900/1100 18 177 159 195
26,5 950/1050WR 31 552 525 580
32 950/1050WR 36 804 760 850

Expansion Shell Anchor (with or without cement grout)

 

  1. dished plate
  2. domed anchor nut
  3. threadbar
  4. cement grout
  5. expansion shell

SN_Anchor

 

  1. dished plate
  2. domed anchor nut
  3. threadbar
  4. cement grout
  5. expansion shell

Resin Bolt

 

  1. dished plate
  2. domed anchor nut
  3. threadbar
  4. cement grout
  5. expansion shell

DYWIDAG Rock Bolts - Anchorages
Anchorage with domed nut and dished plate

steel gradenominal diameterorder No. plateplate dimensionsorder No. nut
[N/mm2][mm] [mm] 
450/7001616 W 213480x80x1016 W 2014
500/5501616 T 2079120x120x516 T 2056
500/5502020 T 2182150x150x820 T 2044
500/5502525 T 2182150x150x825 T 2044
500/5502828 T 2182150x150x1028 T 2044
500/5503232 T 2182180x180x1232 T 2044
670/8001818 TR 2182150x150x1018 TR 2001
670/8002222 TR 2182150x150x1022 TR 2001
670/8002525 TR 2182200x200x1225 TR 2001
670/8002828 TR 2182200x200x1228 TR 2001
670/8003030 TR 2182200x200x1230 TR 2001

Ancchorage with hexagon nut, spherical seat and dished plate

steel grade nominal diameter order No. plate plate dimensions order No. nut order No. spherical seat
[N/mm2] [mm]   [mm]    
500/550 16 16 T 2131 150x150x8 16 T 2002 16 T 2130
500/550 20 20 T 2131 150x150x8 20 T 2002 20 T 2130
500/550 25 25 T 2131 180x180x8 25 T 2002 25 T 2130
500/550 28 28 T 2131 200x200x10 28 T 2002 28 T 2130
500/550 32 32 T 2131 200x200x12 32 T 2002 32 T 2130
900/1100 15 15 F 2131 150x150x8 15 F 2002 15 F 2130

Anchorage for rock bolts with steel grade St950/1050

steel grade nominal diameter order No. plate plate dimensions order No. nut
[N/mm2] [mm]   [mm]  
950/1050 26,5 26 WR 2011 150x150x35 26 WR 2001
950/1050 32 32 WR 2011 180x180x40 32 WR 2001

DYWIDAG Rock Bolts - Accessories

Expansion Shell

borehole diametertype DSI for bar sizesrock
quality		length of cone
[mm]15F16T16W18TR20T20W22TR25T25TR26WR28T28TR30TR32T[mm]
33/372128hard35
34/382184potassium50
34/382185medium hard65
34/382135hard35
39/462117hard50
44/472185potassium85
43/482136hard47
50/582137hard50
59/602221hard65

Required resin cartridge volumes

Selection criteria

undergroundexpansion shellresincement grount
usable in cleft ground conditionslimitedlimitedyes
required strength of rock30 N/mm2lowlow
suited for wet boreholeyeslimitedyes
Application technique
corrosion protectionyesyesyes
fast loadingyesyesno
stressingyesyesno
suited for advance through blastinglimitedyesyes
sensible for deviations of the borehole diameteryesyesno