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:
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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.
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R-Thread Anchor Bolt Technial Data
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|
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.
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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.
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Anchor Plate
Â
|
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
Â
|
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
Â
|
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
Â
|
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.
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