R thread Self Drilling Anchor Bars - Geotechnical ...
SINODRILLS R thread Self Drilling Anchor Bars
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The hollow anchor bar serves as the core of a self-drilling anchor, featuring a hollow steel tube with an outer round thread. A sacrificial anchor bit is connected at one end, while a plate and nut connect at the other end. For projects requiring extended lengths, two hollow anchor bars can be joined using a coupling.
The Self Drilling Anchor system integrates a hollow threaded anchor bar with a sacrificial drill bit, which executes drilling, anchoring, and grouting in a singular operation. It is predominantly employed for slope stabilization, tunneling pre-support, and foundations with micro piles, frequently seen in mining, tunneling, railway, and metro construction projects.
Features
' Stable quality;
' Thread complies with ISO and other international standards;
' Excellent mechanical performance.
Applications
Utilized for pre-supporting, micropiling for foundation underpinning, and slope anchorage.
Technical Parameters
Size
O.D (mm)
I.D (mm)
Ultimate Load (kN)
Yield Load (kN)
Weight (kg/meter)
R25N-14
25.0
14.0
200
150
2.3
R32L-22
32.0
22.0
210
160
2.8
R32N-21
32.0
21.0
280
230
2.9
R32N-18.5
32.0
18.5
280
230
3.4
R32S-17.5
32.0
17.5
360
280
3.5
R32S-15
32.0
15.0
360
280
4.1
R32SS-14
32.0
14.0
405
350
4.3
R38N-21
38.0
21.0
500
400
4.8
R38N-19
38.0
19.0
500
400
5.5
R38S-18
38.0
18.0
560
460
6.0
R51L-38
51.0
38.0
550
450
6.0
R51L-36
51.0
36.0
550
450
7.6
R51N-36
51.0
36.0
800
630
7.6
R51N-33
51.0
33.0
800
630
8.4
R51S-30
51.0
30.0
930
730
9.4
T76N-49
76.0
49.0
16.5
T76S-45
76.0
45.0
19
Thread direction: Left hand / Right hand
Thread standard: ISO / ISO / Other international standards
Please contact our sales team for additional specifications.
Construction Advantages of Self Drilling Anchor Bars
Self drilling anchor bars play a crucial role in tunneling pre-support, widely used across mining, tunneling, railway, and metro tunnel projects. The R32 self drilling anchor is particularly valued in the R-thread category due to its superior reliability and extensive applicability in railway and metro tunnel initiatives. In challenging geological conditions characterized by broken rock, weathered rock, loose soil, and sediment layers, self drilling anchor bars effectively enhance surrounding rock stability and achieve optimal support when deployed for pre-support and radial support in metro tunnels.
Construction Advantages of Self Drilling Anchor Bars
Thanks to the unique structure of the self drilling anchor bar, several advantages arise during the anchoring process:
1. Enhanced Construction Efficiency.
The self drilling anchor bar combines drilling, grouting, and anchoring into a single operation, significantly reducing time and labor needs.
2. Ideal for Challenging Stratums.
When faced with weak or broken strata, drilling can be problematic and may even lead to collapses. The self drilling anchor bar mitigates these issues by remaining in situ after hole drilling, preventing collapses and minimizing construction difficulties.
3. Versatile Adaptability.
The thread is evenly distributed over the entire body of the self drilling anchor bar, allowing for cutting at any point and lengthening as needed. Various materials and sizes are available to fit diverse construction conditions.
4. High Anchorage Strength.
The threads on the self drilling anchor bar form robust connections with both couplings and the grouting body.
5. Superior Anchoring Effects.
During grouting, materials are injected from the base of the hole ensuring full and dense fill, thus achieving high grouting quality.
6. Simplified Construction Process.
In comparison to traditional anchor bars, self drilling anchor bars simplify and accelerate construction by reducing the number of steps required for pull-out, installation, and grouting.
Contact us to explore your needs regarding 5 Inch DTH Hammer. Our knowledgeable sales team is here to assist you in identifying the best options for your requirements.
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