R thread Self Drilling Anchor Bars - Geotechnical ...

SINODRILLS R thread Self Drilling Anchor Bars

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Hollow anchor bar is the body of a self-drilling anchor, as a hollow steel tube with an outer round thread, hollow anchor has the sacrificial anchor bit connected at one side, plate and nut connected at the other; two hollow anchor bars could be connected together via a coupling, for duties that requiring longer anchors.

The Self Drilling Anchor system is comprised of a hollow threaded anchor bar with a sacrificial drill bit that performs drilling, anchoring and grouting in a single operation. Self drilling anchor system is mainly used in slope stabilization, tunneling pre-support, foundations with micro piles etc jobs, which is widely used in mining, tunneling, railway, metro construction etc projects.

Features

&#; Stable quality;

&#; Thread is compatible with ISO and other international standards;

&#; Good mechanical performance.

Applications

Pre-supporting, micropiling for foundation underpinning, slope anchorage, etc.

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

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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 standsrd: ISO / ISO / Other international standards

Please contact our sales team for more specifications.

Self drilling anchor bar is mainly used in tunneling pre-support, which is widely used in mining, tunneling, railway, metro tunnel projects. R32 self drilling anchor takes a significant place in R-thread types for it&#;s superior reliability and extensive application in railway system and metro tunnel project. Under the condition of broken rock, weathered rock, loose soil, sediment layer and complex formations which are difficult to drill holes, self drilling anchor bar can efficiently support and improve the surrounding rock and achieve an ideal supporting effect when used for pre-support and radial support in the metro tunnel.

Construction Advantages of Self Drilling Anchor Bar
Because of special structures of self drilling anchor bar, there are several advantages during anchoring construction:

1. High efficiency of construction. Self drilling anchor bar combines drilling, grouting and anchoring together, with saving time and
labor force.

2. Suitable for stratum which is difficult for pore-forming. When encountering weak or broken stratum, it&#;s difficult to drill hole and even happen collapse, while self drilling anchor bar avoids these shortcomings. After drilling hole, anchor bar is stayed in hole, which can not only avoid collapse, but also save time and reduce difficulty for construction.

3. Strong adaptability. Thread is spread on the whole body of self drilling anchor bar, it can be cut at any location and can be lengthened. It has different materials and sizes to suit for different construction conditions.

4. High anchorage strength. Thread on self drilling anchor bar has tight link with coupling and also with grouting body.

5. Good anchoring effect. When grouting, seriflux is grouted from bottom of hole, full and dense, so grouting quality is high.

6. Simple construction. Compared with common anchor bar, construction of self drilling anchor bar is simple and fast, it reduces working procedures of pull-out of hole, anchor bar installation and grouting pipe insert, etc.

http://blog.udn.com/selfdrillanchor/

 

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