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Self-drilling Anchor

 

Application:

 

During the construction of underground works, it is very common to encounter soft rock, fractured zone and large deformation due to high ground stress. In the case of serious collapsing, extra-long anchor is needed instead of ordinary one.

Self-drilling anchor embodies drilling, grouting and anchoring as a whole.

Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It’s irreplaceable in narrow construction environment.

 

    

     

Feature:

1, High penetrability bit

 Easy to penetrate various rocks;

2, High-strength coupling elongated by mechanical cutting technology

  Self-drilling anchor can be used at the place with narrow space, achieving the aim of rock reinforcement with extra-long anchor;

3, High-strength plate and nut

The stress of surrounding rock is uniformly transferred to the rock wall, realizing the purpose of support each other between surrounding rock and anchor.

4, Continuous international standard wave-shape thread

 Anchor can be used with bit to drill holes;

5, Unnecessary to be pulled out

Hollow steel can be used as grouting channel;

6, High pressure grouting stopper

Grouting pressure can be kept at a high level, and the cracks are fully filled and the fractured rock is improved.

7, Embodies drilling, grouting and anchoring as a whole

It’s unnecessary to take the measures of sleeve protecting and pregrouting to drill holes in condition to various surrounding rocks since this anchor and significant anchoring and grouting are achieved.

  

Technical Data

Unlt

R25N

R32L

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outer diameter

mm

25

32

32

32

38

51

51

76

76

Average inner diameter

mm

14

22

18.5

15

19

36

33

51

45

Average cross sectional area

mm2

290

340

430

520

770

890

1070

1900

2500

Ultimate load

KN

200

220

280

360

500

550

800

1600

1900

Yield load

KN

150

180

230

280

400

450

630

1200

1500

Average tensile strengh

N/ mm2

690

650

650

690

650

620

750

840

760

Average yield strengh

N/ mm2

520

530

530

540

520

510

590

630

600

Weight

Kg/m

2.3

2.7

3.4

4.1

6.1

7.0

8.4

17.0

22

Thread standard

-

ISO 102008

ISO1720

Internal atandard

Steel grade

-

Acc.to.EN 10083-1

Delivery lenghts

m

1, 2, 3, 4, 6

The ultimate load and yield load capacity are measured values. The tensile-/yield strenghs are calculated average values.

 

Note:

1) Thread can be changed according to the customer’s require;

2) Length: we can supply any length according to construction require;

3) We can produce self-drilling anchor in various standard and intension according to the customer’s specification;


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