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Self-Drilling Anchor Tools
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General Introduction:

The self-drilling hollow bar anchor system consists of a hollow threaded bar with an attached drill bit that can perform drilling, anchoring and grouting in a single operation. The hollow bar allows air and water to freely pass through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling is completed. Grout fills the hollow bar and completely covers the entire bolt. Couplings can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension.

Self-drilling hollow bar anchor system is the most common used system for rock mass stabilization, especially in tunneling, underground mining and ground engineering industry. It is mainly used for the supporting engineering in the loose and broken rock stratal with difficult to drilling hole. It provides the optimal solution for soil nailing, lock bolting, micro-piling.

Self-drilling hollow bar anchor system fulfills current and increasing demands of the tunneling, mining industry and ground engineering for safer and faster production. The system provides advantages for all areas of its applications, where boreholes would require the time consuming drilling with casing systems in unconsolidated or cohesive soil.

 

Features and Advantages 

Particularly suitable for difficult ground conditions.

An efficient installation since drilling, placing and grouting can be performed in a single operation, saving both time and money.

Self-drilling system eliminates the requirement for a cased borehole in collapsing soils.

Fast, single-step anchoring system with simple equipment able to work with standard track drill (top hammer) or hand-held drilling equipment, eliminating the need for larger casing rigs.

Installation with simultaneous drilling and grouting possible, and post grouting system is simple.

Continuously drilling and grouting under high pressure causes the grout to permeate into looser soils and creates a bulb-effect for increased bond capacity.

Easy installation in all directions, also upwards, and similar installation methods for all ground conditions.

Suitable for working in limited space, height and in areas of difficult access.

Galvanizing for enhanced corrosion protection is available if necessary.

Multiple ranges of drill bits suitable for different ground conditions.

Continuously threaded bar pattern can be cut and coupled anywhere along its length to achieve all lengths.

 

Applications in Tunneling & Ground Engineering:

Radial bolting

Tunnel repair and refurbishment

Cliff and Slope stabilization and reinforcement

Fore poling

Micro injection pile

Face stabilization

Temporary support anchor

Portal preparation

Soil nailing

Rocknetting retention

 

Specification Overview:

Anchor Rods:

Types

Outer Diameter

Average Internal Diameter

Effective External Diameter

mm

mm

mm

R25N

25

14

23

R32N

32

18.5

29.1

R32S

32

15

29.1

R38N

38

19

35.7

R51L

51

36

47.8

R51N

51

33

47.8

T76N

76

51

76

T76S

76

45

76

Length: 1m, 1.5m, 2m, 2.5m, 3m, 3.5m, 4m, 4.5m, 5m, 5.5m, 6m

 

Drill Bits:

Anchor Type

Bit Size

Front Design

R25N

R25-42mm, R25-51mm

Cast Cross Bits, Steel Cross Bits, Steel 3-Cutter Bits, TC Cross Bits, TC 3-Cutter Bits, Steel Arched Bits, TC Arched Bits, Steel Button Bits, TC Button Bits

R32N & R32S

R32-51mm, R32-76mm

R38N

R38-76mm, R38-90mm, R38-115mm

R51L & R51N

R51-85mm, R51-100mm, R51-115mm

T76N & T76S

T76-130mm

 

Anchor Coupling Sleeves, Anchor Nuts & Anchor Plates:

Thread Type

Anchor Couplings

Anchor Nut

Anchor Plates (Square & Round)

Diameter

Length

Hex. Diameter

Length

Hole Diameter

Dimension

(mm)

(mm)

(mm)

(mm)

(mm)

(mm × mm × mm)

R25

38

150

35

35, 41

30

120 × 120 × 6, 150 × 150 × 8,

150 × 150 × 10, 150 × 150 × 8,

150 × 150 × 10, 200 × 200 × 8,

200 × 200 × 10, 200 × 200 × 12,

200 × 200 × 12, 200 × 200 × 30,

250 × 250 × 40, 250 × 250 × 60

R32

42

145, 160, 190

46

45, 65

35

R38

51

180, 220

50

50, 60

35, 40

R51

64

140, 220

75

70

60

T76

97

220

100

80

80

 

For brochure and more product information, please click here to verify your company information and tell us the detail.

 

How to order?

Hollow Anchor Rods: Types + Length

Drill Bits: Head Design + Diameter + Thread

Coupling Sleeve: Diameter + Length + Thread

Nut: Length + Diameter

Plate: Shape + Dimension