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Self-Drilling Anchor Bolts
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Last update: 2024-02-03 22:49
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Product details

Self-drilling anchor system are innovative and efficient construction components that combine drilling, grouting, and anchoring functions into a single integrated system. These rock anchor bolts are designed to simplify the installation process, reduce construction time, and enhance the stability of structures in various geological conditions. A self-drilling anchor bolt typically consists of several essential components, each playing a critical role in its performance:



  



Threaded Hollow Anchor Bar

The threaded hollow anchor bar forms the core structural element of the whole self-drilling anchor system. It provides the necessary load-bearing capacity and is designed to resist tension forces. The thread pattern on the rod allows for easy attachment of drill bits, nuts, plates, and other components. Self-drilling anchor bolts can be categorized based on their threading patterns. Two common types include R-Thread Self-Drilling Anchor Bolts and T-Thread Self-Drilling Anchor Bolts.



 





R-Thread Anchor Bolt Technial Data












































































































 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter

(mm)

25

32

32

38

51

51

76

76

Internal diameter

(mm)

14

19

16

19

36

33

52

45

Ultimate load

capacity

(KN)

200

280

360

500

550

800

1600

1900

Yield load

capacity

(KN)

150

230

280

400

450

630

1200

1500

Tensile strength,

Rp0.2

(N/mm2)

800

800

800

800

800

800

800

800

Yield strength,

Rp0.2

(N/mm2)

650

650

650

650

650

650

650

650

Weight(Kg/m)

2.3

3.2

3.6

5.5

6.5

8.0

16.0

19.7

Thread type

(left-hand)

ISO 10208

ISO 1720

MAI T76 Standard

Steel grade

En10083-1 (Alloy structure steel)

Compared to carbon steel, alloy structure steel has high anti-corrosion capacity and high mechanical.


R thread anchor bar or called rock rod, soil nail, which is a kind of threaded hollow bar, bar surface with an rope thread according to ISO 10208 & 1720. It was firstly invented by MAI on 1960S to solve the low construction speed on complicated underground works, nowadays; it is very popular all around the world.

Thread size: R25, R32, R38, R51, T76.

Thread standard: ISO10208, ISO1720 etc.



 



T-Thread Anchor Bolt Technial Data











































































































Bar Type

Outside Diameter

(mm)

Inside Diameter

(mm)

Cross section

(mm2)

Ultimate Load

KN

Yield Point

KN

Weight

(kg/m)

Thread Left/

Right Hand

30/11

30

11

446

320

260

3.3

Lift or right

30/14

30

14

395

260

220

2.9

Lift or right

30/16

30

16

382

220

180

2.7

Lift or right

40/16

40

16

879

660

525

7.0

Lift or right

40/20

40

20

726

539

430

5.6

Lift or right

52/26

52

26

1337

929

730

10.0

Lift or right

73/53

73

53

1160

1630

970

12.3

Lift or right

73/56

73

56

1094

1414

785

11.1

Lift or right

73/45

73

45

2265

1630

1180

17.8

Lift or right


T thread anchor bar surface with a trapezoidal thread, this design of connection is much stronger and reliable when compared with rope thread, we supply full sizes from T30 to T103.

Thread size: T30, T40, T52, T73, T103, T127, T130.

Thread standard: ISO10208, ISO1720 etc.



 



 



Anchor Plate

































































 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Dimention(mm)

150*150

200*200

200*200

200*200

200*200

250*250

250*250

250*250

Thickness(mm)

8

10

12

12

20

40

40

40

Hole diameter(mm)

30

35

35

41

60

60

80

80

Weight(KG/PC)

1.4

3

3.7

3.6

8.8

18.5

18

18

Cold deformed with geometry




Anchor Coupling






















































 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter(mm)

35

42

42

52

63

63

95

95

Length(mm)

120

145

160or190

180

180

200

200

200

Weight

0.45

0.7

0.75

1.4

1.7

1.9

6.4

6.4

Machined steel coupling middle stop


The hollow bar is continuously threaded, it can be cut and coupled anwhere along its length.

The coupling enables direct end-to-end energy transmission between each bar, reducing losses and ensuring maximum percussive engergy at the drill bit.



Drill Bit
































































 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

diameter(mm)

41,51

51,76,90

90,100,110,115,130

130,150,160,180,200

Hardened cross bit

(EX)

Hardened cross bit for loose to medium dense condition with small boulders.

Tungsten cross bit

(EXX)

TC cross bit for soft to medium rock for mations

Hardened button bit

(ES)

Hardened buuton bit for unconsolidated rock with boulders.

Tungsten carbon button bit

(ESS)

Button bit with TC inserts for medium rock for formations.

Hardened arch bit

(EC)

Hardened drill bit with optimized geometry for uncon solid dated soil

with small boulders.

Tungsten carbon arch bit

(ECC)

TC drill bit with optimized geometry for soft to medium rock formations.

Hardened drop center bit

(EY)

Hardened cross bit for loose to medium dense ground conditions

TC drop center bit

(EY)

TC drill bit for soft to medium rock formations.

Casting clay bit

(EW)

Casting clay bit with optimized geometry for very soft to soft caly.

Machined steel bit or Casring steel bit


The sacrificial drill bit is an important part of the self drilling anchoring system.

Choose suitable bits according to different soil type.



Anchor Nut






















































 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Key size(mm)

41

46

46

50

75

75

100

100

Length(mm)

135

45

45

55

70

70

80

80

Weight(kg/pc)

0.25

0.35

0.35

0.5

1.55

1.55

3.6

3.6

Machined steel nut or casting steel nut


The hexagonal and spherical nuts are made from high precision steel (40Cr,HRC 20-25) to meet the stringent demands on anchor specifications and the daily uses of reinforcement work.

All nuts exceed the ultimate strength of the rod.

http://www.rockboltsolutions.com/

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